Which Oil

Submitted: Wednesday, Oct 15, 2003 at 17:58
ThreadID: 7840 Views:2451 Replies:10 FollowUps:5
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I read the recent posts about frequency etc and thought I'd start another one with regards to engine oil.
I've got a 99 GU 4.2 TD Patrol ute. I recently changed from Castrol RX super which is 15W40 and a CH4 grade to Penrite which was also a CH4 but is 20W60. I did this as I live in the tropics where the manual suggests 20W40 or 20W50 for warmer climates.
The thing is, Castrol has released an upgraded RX super, now CI4 and the price for a 20L drum is around $81 compared to $95 for Penrite.
Should I go back to Castrol when the next service is due or is the difference in quality insignificant.
I paid the extra in the first place as even though they were both CH4, the 20W60 was more applicable for me and I also went on the old "if it's dearer, it's usually better" approach.
Thanks.
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