I was wondering which is the best oil for our NA suby engines...

Synthetic / semi synthetic?

Tell us your thoughts.

For a NA 90's Suby engine semi synthetic 10W-40 is very suitable.

You can go for a fully synthetic if you want, but it has been proved that they can do 300,000 k's easy on common oil

I do an oil change every 10,000 with 10W-40

Penrite oil website has a lot of interesting info to read.

I've got 10w-40 in mine too.

DO NOT use 20w-50 = noisy lifters... don't ask me how I know this...

I have used 15w-50 but i was having noisy lifters as pete said, and now i have change it with castrol 10w40 magnatec semisynthetic.
The engine is running more quite than before and the noisy lifters gone away!

Thanks for sharing!

I tried 10/40 Pennzoil in mine on the last oil change, it was happier on GTX3 15/40w
Ran slightly higher pressure and lower oil temps

I change mine every 5000k, oil is cheap

so are EJ22s

EJ22's in Melbourne are $550 no guarantee, or

$990 with new cambelt and waterpump and a 3 month guarantee

Geez and for only about $400 you can buy a whole car and test drive your new engine home, not take the wreckers word its good

then pay for most of it selling the gearbox and wheels

Um... I think it's running the real classy stuff. Black and gold 20W50. Or it could be Castrol GTX. probably the former though.