Dirty Daytona
Well-Known Member
- Joined
- Mar 8, 2019
- Messages
- 702
- Reaction score
- 1,066
any opinions on the best engine oil to use in 496 HO? Thanks
Thanks and which filter do you run?Here we go again...
Mobil 1 10W-30 in both of mine. Never experienced a lubrication problem whatsoever. Did chuck a head gasket (not lube related) last year and Namba860 at Offshore Marine did the repairs. After about 150 hours or so on the engine, the original cross hatch marks on the cylinders were still plainly visible.
Thanks and which filter do you run?
Lol thanks wizard. You truly are a wizard because you read minds
Switched the oil in my car while ago from Mobil 1 10W-30 to Shell T5 Rotella 10W-40 and oil pressure doesn't waiver much, even when running on the track.15w40 diesel oil
Or
Vavoline 20w50 vr1
Switched the oil in my car while ago from Mobil 1 10W-30 to Shell T5 Rotella 10W-40 and oil pressure doesn't waiver much, even when running on the track.
Mobil 1 10W-30 is for cars with tighter bearing clearances. 25W-40 is the right viscosity for boat engines with looser bearing clearances, operating higher rpm ranges and loads.If I ran 10W-30 in my 6.2 Mercs, oil pressures will drop low at idle after hard ride. The recommended oil was Mobil 1 10W-30 for my Viper, yet later, Chrysler revised using heavier oil , especially for folks like to run their cars harder.
Boat engines run hard once they're going faster the trolling speed.
15w40 diesel oil
Or
Vavoline 20w50 vr1
Never heard of a Viper engine fail using the M1 10w-30 though. My 72 340 in my new Challenger never gave an issue for 8yrs I've owned it, albeit quality of the rest of the car wasn't as stellar.Overall, my 68 Barracuda 340, 68 charger 383 and my Jeep Cherokees all had excellent engines, 1990 4.0 6 cyl, 1998 318 and wife's 2010 5.7 Hemi, all had good reliabilities.That's because Dodges start coming apart and the tolerances get loose after about 3 hours or so.
Mobil 1 10W-30 is for cars with tighter bearing clearances. 25W-40 is the right viscosity for boat engines with looser bearing clearances, operating higher rpm ranges and loads.If I ran 10W-30 in my 6.2 Mercs, oil pressures will drop low at idle after hard ride. The recommended oil was Mobil 1 10W-30 for my Viper, yet later, Chrysler revised using heavier oil , especially for folks like to run their cars harder.
Boat engines run hard once they're going faster than trolling speed.
Thread jacker. We are talking about 496 merc engine. Stay on track please . Before activated makes his stupid " threadjacker "I run Castrol GTX 20W50 in my car and change it every 8-10 hours of track use.
Thread jacker. We are talking about 496 merc engine. Stay on track please . Before activated makes his stupid " threadjacker "
Comment
Sent from my SM-G930V using Tapatalk
You bought the wrong stuff. LOLOk boys thanks for all the help. I just bought 10 quarts of mobil 1 10W-30 and a Napa filter so that's what I'm going to try!!!!!!
Fuck it then!!! I’ll use beer lolYou bought the wrong stuff. LOL
Ok boys thanks for all the help. I just bought 10 quarts of mobil 1 10W-30 and a Napa filter so that's what I'm going to try!!!!!!
You guys are overthinking it. Just do what Mercury recommends. It's a 496HO not some race motor. This reminds me when I had a conversation with a Mercury guy at a boat show and I was asking about soot on the transom with the 496. He asked me what kind of gas I was running and I said "don't even go there, I'm running Chevron Supreme 91 only"....He says "there's your problem, find the cheapest 87 octane you can find and run that". Sure as shit he was right.
That's true of any ICE, higher octane is designed for higher compression ratios to prevent preignition.You guys are overthinking it. Just do what Mercury recommends. It's a 496HO not some race motor. This reminds me when I had a conversation with a Mercury guy at a boat show and I was asking about soot on the transom with the 496. He asked me what kind of gas I was running and I said "don't even go there, I'm running Chevron Supreme 91 only"....He says "there's your problem, find the cheapest 87 octane you can find and run that". Sure as shit he was right.
Too thinOk boys thanks for all the help. I just bought 10 quarts of mobil 1 10W-30 and a Napa filter so that's what I'm going to try!!!!!!
Well that’s the biggest mistake people make all the time.
They think “high octane” fuel makes more power.
You make the most power on the lowest octane you can run without pre detonation.
Amsoil marine. 10w-30 seems thin to me especially down in the heat if the desert.
I use full syn 10w-40 amsoil. Amsoil guarantees better protection than straight 40.
Although at this time running their 25w-40, didn't notice it was semi syn when I ordered it. But It holds higher oil pressure than the 10w-40.
What a lot of the input above (while most of it is good info) doesn't consider is the actual operating temperature of marine engines is lower. Usually 165 degrees or so versus around 210 for auto applications. A thinner oil won't be as thin in the boat as it would in the car.
What a lot of the input above (while most of it is good info) doesn't consider is the actual operating temperature of marine engines is lower. Usually 165 degrees or so versus around 210 for auto applications. A thinner oil won't be as thin in the boat as it would in the car.
What the viscosity differences between 200° oil and 240° oil?
With water temp at 140, I can make the oil temp go from 190 to 225 in about 5 minutes. Maybe less
Water temp doesn't move.
Using Delo 400
Dan'l
You guys are overthinking it. Just do what Mercury recommends. It's a 496HO not some race motor. This reminds me when I had a conversation with a Mercury guy at a boat show and I was asking about soot on the transom with the 496. He asked me what kind of gas I was running and I said "don't even go there, I'm running Chevron Supreme 91 only"....He says "there's your problem, find the cheapest 87 octane you can find and run that". Sure as shit he was right.
Viscosity as it relates to different temperatures depends on the oil. Could be quite a bit.
With your water temp at 140 and the oil at 225, what would the oil temp be if you ran that engine at a 210? Guaranteed the oil temp would be higher and as a result, the oil would be thinner.
A BBC needs only about 7 pounds of oil pressure to lubricate sufficiently, so a drop in oil pressure after a hard run never concerned me.
All personal preference, but I know Mobil 1 has been tested extensively and it consistently shows the least amount of wear. Never knew anybody that had an oil caused lubrication problem running it in a boat or anything else.
I never had a lubrication problem, but my 502 did consume a shitload of Mobile 1 when I switched to their 15w50 synthetic. Now, 502 "MAG" motors (and their VP counterparts) are known to consume oil due to the bores being out of round from the factory, and the piston / ring package they run also causes oil consumption issues. My motor was drinking 1.5 quarts over a 4 day river trip on Mobile 1. Swapped back to Castrol GTX 20-50 conventional, and the oil consumption ceased, almost completely.
I also noticed that the motor used about 1/2 quart a trip on the factory specified Volvo Penta 30w. It also used 1/2 quart a trip running Delo 15-40. Castrol GTX 20w50 - Winner for me
I never had a lubrication problem, but my 502 did consume a shitload of Mobile 1 when I switched to their 15w50 synthetic. Now, 502 "MAG" motors (and their VP counterparts) are known to consume oil due to the bores being out of round from the factory, and the piston / ring package they run also causes oil consumption issues. My motor was drinking 1.5 quarts over a 4 day river trip on Mobile 1. Swapped back to Castrol GTX 20-50 conventional, and the oil consumption ceased, almost completely.
I also noticed that the motor used about 1/2 quart a trip on the factory specified Volvo Penta 30w. It also used 1/2 quart a trip running Delo 15-40. Castrol GTX 20w50 - Winner for me
Viscosity as it relates to different temperatures depends on the oil. Could be quite a bit.
With your water temp at 140 and the oil at 225, what would the oil temp be if you ran that engine at a 210? Guaranteed the oil temp would be higher and as a result, the oil would be thinner.
A BBC needs only about 7 pounds of oil pressure to lubricate sufficiently, so a drop in oil pressure after a hard run never concerned me.
All personal preference, but I know Mobil 1 has been tested extensively and it consistently shows the least amount of wear. Never knew anybody that had an oil caused lubrication problem running it in a boat or anything else.
Maybe. Something worked, whatever it was I just stick with the 20/50 GTX and am happy it stays in thereI wonder if that little bit of extra viscosity was enough to keep it in the crankcase?
Sent from my iPhone using Tapatalk Pro