Quote:
Originally Posted by Fairlane Al
I hope I'm not the only one here who will admit to just running whatever 15w40 oil is on cheap special at Repco or Supercheap. Admittedly changed every 5 to 7000 km and mainly doing fairly easy highway cruising, it comes out somewhat darker and dirtier than when it went in but not particularly so. Right now it is running Nulon oil, before that Shell HX5.
I have considered if I should upgrade to a nicer semi synthetic or synthetic oil but I can't see the point when it still holds good oil pressure nicely at 260,000 km, at least according to the gauge, it doesn't make noises, and I haven't blown the motor up yet. At least I'm changing the oil, I don't think the previous owner knew or cared to know that oil is best changed on a regular basis.
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Up to 200000 I used castrol gtx 15w40 changed every 150000km, city driving.
I did about a year on penrite 15w60 and penrite gas after that to see if there was any difference. Car felt slightly "heavier" on acceleration, but other than that, no difference. I even had it tested and at 15000km and the oil was as new - run mainly on LPG. The main issue was that the dirt was beginning to build up in the oil. If it was worthwhile to run a bypass filter, I wouldn't bother
changing the oil!! Stretch the change out to 40k to 50k.
Back on the supercheap specials now. I was planning on doing another test, but the oil testing company I was using wasn't taking samples at the time. I will post up next time I get a result.