ok, i've read tons of post with people recommending these. does anyone have any test data showing which would be best for a 87 turbo?

 

simple high heat from rotary...20w50 dissapates the heat better its also thicker you it with lub better

 

simple high heat from rotary...20w50 dissapates the heat better its also thicker it with lub better

 

Starting and operating above 20F= 20W50
Starting and operating between -10F and 80F = 10W30
Starting and operating below 30F = 5W30

Mazda factory recommendations for a S4 Turbo.

BTW: Its been covered here about a thousand times, you may wish to read the thread on neebies before you post and use the search function found in the upper right hand corner of this page

You may also wish to read the what oil you use thread, on this board as it has links and anything you could ever want to know about oils.