Oil for Ram Charger 318

Messages
49
Location
north carolina
My Brother-in-law just bought an 85 Ram Charger. Unsure of the mileage. Could be 77,000 or more likely 177,000. Who knows. Looks and drives good for an older vehicle. Truck has a tiny leak and probably consumes a little. He's leaning toward putting in an oil with a long life name, such as Pennzoil LL. I said that should be good, just get something thick, like a straight 30wt or a thicker multigrade like 15W40. The 30wt can be run pretty much year round and might stop the leaking on the driveway. I know someone who does so in this climate without starting problems on older engines. The 15W40 would be better overall but might not stop the leak in the driveway. Any suggestions? Am I way off base?
 

Al

Messages
19,251
Location
Elizabethtown, Pa
Well, the difference in viscosity at say 80 F between a 15W and 30 W does exist. The 15W is maybe 150cSt and the 30wt. is 250 cSt. But the thing is that the viscosity of a 30 wt at operating temperature is only 10 cSt. The leakage is occurring as the car is being driven and the drops fall on the driveway shortly after the car is stopped. The 15W-40 probably would help some. It would be a good choice for this engine in NC also.
 
Messages
699
Location
Texas
Auto-Rx works wonders in most applications, but if you are leaking from the rear main seal it will probably not work since the seal is just some "rope". In my '87 RC I've used 15w-40 Schaeffers/1300s/and now I'm using Schaeffers 20w-50. It'll leak a drop or two a day. Oh well, it is an oldie but goodie!
 
Messages
188
Location
Charleston, SC
Ive always been leary of Pennzoil due to the fact that I hear that the detergents in it treat the seals in such a way that if you change oils again, it would cause it to leak, but thats just what i've heard over the years.
 
Top