best oil and grade for pro charged carborated hp500?
 

just wondering what you guys are using with good luck. reguler or synthetic what brand and grade?.while im at it oil filter brand also fram/merc?.thanks sean

I use Mobil 1 15-50. Iwas using Wix filters but am switching to Fram HP4

royal purple staight weight 40 synthetic

Non Sc 500 EFI, But I run straight 40 wt. Valvoline VR-1 Racing Oil and a Wix filter.

You got 3 choices:

Straight weight 30wt or 40 wt conventional oil.
Merc 15/40 conventional oil.
Any full synthetic 5w-40 oil.

Don't use a conventional multi-vis oil.

Which is best? Whichever one you change out most often. That's the one that is the best.

mcollinstn, hit the nail on the head. I would bet that any of the oil these days is way better than the oil of the 60-70's and it worked pretty good back then.
I use mobile1 15-50. but I'm sure there is better. Any kind of oil is better than no oil. If I was boating in the south, for long periods, I would probably use a straight wieght oil because of the hot temps. Where we are at, the water temp is only 60 degree when we start boating in the spring and the heavy oil is not the best in this enviroment so the multi-vis seems to be the better.

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synthetic 15w-50 is not multi vis. It is an equivalency relation. 15w-50 M1 flows like SAE15 at low temps and like SAE50 at high temps. It doesn't contain different stocks with different makeups like conventional multi vis.

synthetics are great, but will get contaminated just as fast as any cheap oil. and there is no better oil than fresh oil.

if you got the $ use synth and change it often.
if you don't have the $ then use conventionals and change them often. Don't use synth and leave it in there forever - it doesn't work like that.

You bring up a good pt. If you change the oil every 25 hrs., do you really need to use synthetic on a blown application? Especially for recreational use? I know 95% of my driving is between 3200 and 3500, with WOT bursts that last no longer than 1 minute....ever! With the quality of conventional oil, would it not make $ sense to use it instead of synthetic?