re: which synthetic I suggest,
In a word: Dunno.
I use Mobil1, my mechanic friend does as well.
I hear that Redline is very good as well, but Mobil1 is $3.99
in the supermarket. I was NOT as impressed by Castrol Synmtech.
I'm sure its fine, but....
Redl;ine has an informative package they will send out.
Looking at the "brand X" and "brand Y" and checking
weight ranges, I think I guessed which was Mobila nd
which was Castrol. According to Redline, the Mobil fared
I still maintain the best advice is:
1) use any SH oil you want
2) change it often
3) easy on cold engines
go to #1)