Oil recommendation - E85 with some WOT blowby
07-05-2011, 08:58 AM
#1
Oil recommendation - E85 with some WOT blowby I have a 11.8 CR 60k mi stock shortblock LT1 with heads and custom cam that is spec'd and tuned strictly for E85 only. I have a slight puff from the breather at idle and at high RPM (over 400)at WOT it starts to smoke a little blue out the back, and a little oil residue on the exhaust tips, but at idle and low RPM/normal driving, it doesn't seem to burn anything, exhaust tips stay completely clean. As far as oil system, I have a Melling Select pump with 70psi high pressure spring, and 6-qt Canton Road Race pan. Oil pressure even when trying 5w30 has never been below about 45 psi hot idle. Coolant temp never gets above about 195 even in stop and go city 95* heat, running stock 185* t-stat.
So I have 2 questions:
1) What type of oil is recommended for E85 use? I know a more frequent oil change interval is preferred, but what is the best type? My Harland Sharp roller rockers recommended a high ZDDP content oil, so should I use VR1, diesel, other?
2) What grade of oil would be best? I assume since is a stock block LT1, with 60k miles that bearing clearances are still pretty tight, however there is the blowby issue as well. Would a thicker high temp weight oil help that out? Such as 15w40 or 20w50?
So I have 2 questions:
1) What type of oil is recommended for E85 use? I know a more frequent oil change interval is preferred, but what is the best type? My Harland Sharp roller rockers recommended a high ZDDP content oil, so should I use VR1, diesel, other?
2) What grade of oil would be best? I assume since is a stock block LT1, with 60k miles that bearing clearances are still pretty tight, however there is the blowby issue as well. Would a thicker high temp weight oil help that out? Such as 15w40 or 20w50?
