Quote
Mix oils to you hearts content. They are absolutely required to be compatable, and are.

Mixing an old SC oil with a newer SJ oil gives you the overall properties of the SD. Mixing a 10w-30 with a 20w-50 does indeed give you roughly a 15w-40. Mix synthetics with regular oils if you wish. Then you can brag about running a synthetic blend.

The only oil mix I wouldn't do is running a non-detergent oil. It does promote sludging and certainly isn't good in a modern engine. Modern being anything made after the early 60's in this case.

I compeletely agree with everything foxtrapper said. Anyone who says you can not mix brands or dino/syn is seriously misinformed. <img src="/forums/images/graemlins/confused.gif" alt="" />


Quote
B- Run a synthetic motor oil (not castrol it's fake synthetic).

Also, J94, what exactly is *fake synthetic*??? <img src="/forums/images/graemlins/confused.gif" alt="" />


And 5W30 is specified on newer engines because it provides more power and better mileage than thicker oils. That is also why some cars spec 0W20 nowadays.

hupptoy

99 4Runner SR5 3.4 Auto 4x4, 32" LTX A/T, 154K
93 Toy x-cab 22RE 5-spd 4x4, 31" LTX A/T, 150K