best motor oil for 91 Mazda 626?

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Originally Posted By: hal
im tempted. im pretty sure the motor is spec'd for an Xw40 weight as well. and considering its age it might be of benefit. i mean if it works in a hard-working diesel engine then it should be great for a 4-banger with 164k miles.

now im torn. i know maxlife is good also.


Rotella HDEO is also available in 10W-30 and even some newer pieces of off-road construction equipment prefer it....

I'd use a HM oil like MaxLife, Pennzoil, or Castrol in probably a 10W-30 weight for summer...
 
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