Oil
 

What oil do you'll recomend running in stock 1992, 502 carb. motors.

Re: Oil
 

I have always run RedLine 40wt race with just enough of their 10-40 to get some additives per their suggestion.

Re: Oil
 

Pachangia thanks for the info.

Re: Oil
 

I prefer the Merc oil myself. Been told it has additives to fight condensation more than regular oils. Don't know fact or fiction thou

Re: Oil
 

Mobil One....

Change the oil + filter every 10 hours...

It's the Life's blood of your motor.......

Re: Oil
 

If your motor has Roller Cam setup use Merc 25W-40 oil. If it has flat tappet cam setup use Amsoil 20w-50. Synthetics in a stock roller setup will allow the rollers to slide on the cam instead of roll and wears flat spots in the rollers. This applies only to stock motors using stock valve springs. Raise the spring pressure and synthetic is the way to go. BTW ... Merc oil has produced the highest oil pressure numbers in any motor that I have ever seen. Think it holds its consistency well under extreme use.

- Vinnie

Re: Oil
 

I saw some roller rockers get flat spots on the roller tips...the guy was using syn. Mobil 1. in his 525SC's

Re: Oil
 

The synthetic oil is way to slippery to use with stock components. The rollers in the rocker tips were not rolling ... instead they were sliding on the valve stem.

- Vinnie

Re: Oil
 

Stock motor, use Merc.

Re: Oil
 

Look up some past threads with "Hydrocruiser" he is da man with oil knowledge. Very informative. :D

Re: Oil
 

I've been using 15W-40 Royal Purple in everything for years and I've never had an oil-related failure.

If I could drink it, I would.

Re: Oil
 

After reading several articles on the subject the most knowledgeable people in the petroleum business maintain that synthetic base stocks are not any more slippery than conventional oil base stocks. What makes oil "slippery" or "slipperier" are the friction reduction additives that are added to the oils.

Bob:

"Synthetic base oils have lower coefficients of friction than do mineral oils. Synthetic oils also have higher bulk film strengths (as proven by ASTM 3328), better thermal and oxidative stability, and better base VI's than do mineral oils.

Synthetic base oils have better friction modification (reduction) as compared to mineral oils. FM additives added to BOTH synthetic and mineral oils reduce the friction coefficient of the oil by another magnitude.

No currently available (to consumers) oils by themselves can provide Extreme Pressure reisistance without additives. This is where the AW/EP additives come into play. Some of these additives are ZDDP, MoTDC, SnTDC, Boron (Borate-type) Esters, concentrated Calcium Carbonate Sulfonates, Phosphate Esters, Sulferized olefins, Nitrogen compounds, and others".



If the oil is API certified and it is "SL" whether synthetic or conventional it will perform in a similar manner.

Every BMW; Porsche; Mercedes Benz; C-6 Corvette; Viper all require Mobil-1 synthetic oil. They all have roller rockers. No flat-spotting after lots of tests.

Why would synthetics flat a Merc 525 and not all these other vehicles that are also run very hard at times with rollers?

I think synthetic oil and flat-topping is possibly more a myth and not a fact. Take out the friction reducers and you increase wear. I say re-evaluate the roller/rockers you are using first and their tolerances. :p