Re: motor oil , which one??

["Jason Kendall" <jasonk@widomaker.com>]

You're using 10w-40 for the break in?????  My father is an engineer for GM in their power train plant.  When I rebuilt the motor on my old 8v Scirocco, he (my father), as well as the other engineers agreed that 5w-30 had to be used.  They all said that 10w-40 was waaayyyyy too thick.  And they scolded me when I told them that I run 20w-50 in it too.  They said that 20w-50 was like putting molasses into the engine, it robs horse power and causes excess heat. 

Now these aren't my thoughts, just what I was told.  And I know that they build low revving American engines, but still, these are the guys that are building motors, period..... so I figure that their advice is pretty credible.

Just take this advice for what it is, I'm not trying to start battles.....everyone has there own opinions.  Just passing along info.

 

 

-Jason

98 GTI VR6

88 Scirocco 16v

 

 

 

Hello, Finally  re-subscribed thanks to everyone!

 

What does the list say about which oil weight to use??  Here's the scenario

 

Question:  88 16V 1.8L with rebuilt head and rebuilt motor:

After I do the 3000 miles of breaing in, which I have 500 miles so far with 10w-40 oil, what oil weight should I use?

Should I stay with organic 10w-40 (as per my mechanic)? or

go to 20w-50(mechanic says no need to b/c everything is new in the motor)?

 or switch to synthetic (mechanic says no big difference)?

 

Peace

Rich Z