Hi all,
Looking for an oil recommendation for a Pontiac V8. 4.35 bore, 4.25 stroke, 2618 pistons, 505 CID, 10:1 compression, aluminum heads, forged crank & rods, Holley 850 double pumper. Cam is a retrofit hydraulic roller with just under .600 lift, 236 @ .050 intake duration and around 130 lbs of spring pressure on the seat. Real basic hydraulic roller hot rod engine. 65 GTO with a muncie four speed.
I’ve run the Valvoline VR-1 10w30 and Supertech 15w40. Both seem fine, the 15w40 has more pressure when really hot and the 10w30 comes up quicker in the cold.
I live in Spokane and we get some really cold days and some really hot days. Pontiacs tend to run hot and I sometimes let ‘er eat a little bit, so on one hand I’d like a heavier weight oil. At the same time, I find it really limiting to only drive on warm days and there are a lot of very cold but clear days where I’d be perfectly happy to drive my car. But the 15w40 seems a little thick for really cold days.
Is there any reason not to run something like a 5w50 Mobil 1 or Castrol Edge in this engine? Both of those seem to be widely available and reasonably priced. Seems like most of the old hot rod guys tend to run oils marketed more for that segment, but other than the flat tappet ZDDP issue I’m not really sure why. Seems like I could run a 5w50 and have my cake and eat it too, so to speak - drive the car any day of the year without thinking twice, no?
Thanks!
Looking for an oil recommendation for a Pontiac V8. 4.35 bore, 4.25 stroke, 2618 pistons, 505 CID, 10:1 compression, aluminum heads, forged crank & rods, Holley 850 double pumper. Cam is a retrofit hydraulic roller with just under .600 lift, 236 @ .050 intake duration and around 130 lbs of spring pressure on the seat. Real basic hydraulic roller hot rod engine. 65 GTO with a muncie four speed.
I’ve run the Valvoline VR-1 10w30 and Supertech 15w40. Both seem fine, the 15w40 has more pressure when really hot and the 10w30 comes up quicker in the cold.
I live in Spokane and we get some really cold days and some really hot days. Pontiacs tend to run hot and I sometimes let ‘er eat a little bit, so on one hand I’d like a heavier weight oil. At the same time, I find it really limiting to only drive on warm days and there are a lot of very cold but clear days where I’d be perfectly happy to drive my car. But the 15w40 seems a little thick for really cold days.
Is there any reason not to run something like a 5w50 Mobil 1 or Castrol Edge in this engine? Both of those seem to be widely available and reasonably priced. Seems like most of the old hot rod guys tend to run oils marketed more for that segment, but other than the flat tappet ZDDP issue I’m not really sure why. Seems like I could run a 5w50 and have my cake and eat it too, so to speak - drive the car any day of the year without thinking twice, no?
Thanks!