i use what ever is on sale at a discount when i need it. i need it every 5k miles for each of the 4 or 5 cars i have on the road at the time, it varies.
i have done this since 1982 when i bought an isuzu / chevy luv diesel pickup. i have never had a lubricant related failure.
i believe changing it is more important than what you use.
82 isuzu diesel pickup - drove it from 0 miles till the manual trans failed in 1990, miles unknown i just can't remember.
90 nissan pick up - drove it from 0 to 170k miles, still have it - farm use.
93 legacy - drove from 98k to 175k and wrecked it.
95 legacy - drove it from 75k to 165k, replaced the auto trans, my son drove it to 208k at college, sold it this year.
97 outback ltd - drove it from 95k to 145k w/ piston slap and sold it 2 years ago. she wrecked it at college.
97 GT w/ ej22 swap, bought it with 125k (bad ej25) and still driving it at 157k.
97 toyota avalon - my wife has driven it from 62k to 202k and is now talking about replacing it.
i do not recommend recycled motor oil for you car, but using fresh recycled / re-manufactured oil is better than not changing the old oil you have 3k - 5k on now and running it another 3k - 5k.
just my opinion.
Last edited by johnegg; 01-30-2013 at 08:45 AM..