Maxlife 5w30 at Walmart for $12 or Mobil 1 10w30 High Mileage $22

 

10w-30 castrol high mileage (mines at 172,000 and still strong!) plus i have the lucas oil additive as well...

 

surprised to see that so many run syn. oil. that stuff would leak right out of my car. I dont even try it.

 

5W-30 Mobile 1 Synthetic... No leaks whatsoever

 

Mine leaked for about the first 3 weeks after switching to synthetic, but I haven't noticed anything for the past few weeks.

 

200,000 + on Valvoline 5-30 (like the book says)
(very frequent oil changes)
everything is stock with no engine repairs at all

 

the only leak in my motor is the rear main seal i think. Never noticed any intake leak and i just did headgaskets so i think i would of noticed someting like that.

 

10W-40, Dino, year around with regular changes of good quality oil and filter. JMHO

 

Why do you think you need to change? Just keep using what you're using.

 

I dont, just wanted to see what everyone else is using. Hence why i said "just looking to see whats popular".
Was thinking that if there was a lot of people using X brand I would give it a shot.

 

0w-30 German Castrol Synthetic. 110,xxx on it runs very strong and has taken a mad beating

 

everyone is running high weights! I had a teacher in school that is a prototype engine developer for Ford and they use 5w-20 for the higher HP that is produces and the better gas mileage they get out of it. I run Mobil 1 5W-30 but I think the 40 and 50 weights, even synthetics are unnecessary! to each his own but I think the extra weight if not needed are robbing HP and taking away from the LT1s potential to get good mpg.

just my .02

 

The question is how much loss are we talking about, vs not needed viscosity.

 

not an LT1 but, 186K miles, valvoline 10w30 conventional. Doesnt always get oil changes when it should, will lose half a quart at about 3200 miles (to remind me I guess) and stays there until I add it back in or change the oil. AC Delco filters btw. Always clean too.

 

any more?