motor oil for 80 series cruiser

Submitted: Wednesday, Nov 19, 2003 at 17:48
ThreadID: 8625 Views:1752 Replies:5 FollowUps:2
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Hi all,
I am about to do a 90,000 km oil change on a '97 Petrol Cruiser. I have read some of the previous posts but am a bit confused. It currently has a synthetic motor oil in it. Is it safe to change to a mineral oil ? Also, what viscosity should I use? BTW, we will be beginning our 'round Oz trip next April.

All comments would be appreciated. Thanks,

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Reply By: Member - John- Wednesday, Nov 19, 2003 at 20:47

Wednesday, Nov 19, 2003 at 20:47
Hi Steven,

My advice would be to stay with the synthetic oil. My personal opinion is that synthetics are so far ahead of mineral oils, to consider going back would be crazy.

Having said this, there would be no issues with switching back to mineral oil if that is what you want to do.

From my experience - based on oil analysis samples over the years - any cost savings by using mineral oil would be very short term compared with the benefits of using synthetics. Do some research!

AnswerID: 37853

Reply By: cokeaddict - Wednesday, Nov 19, 2003 at 21:28

Wednesday, Nov 19, 2003 at 21:28
Steve, I agree with John old mate. Definately stick with what your using.
AnswerID: 37858

Reply By: Member - Bradley- Thursday, Nov 20, 2003 at 11:34

Thursday, Nov 20, 2003 at 11:34
fully agree with the others, if it's been running a syn since it was run in then stick with it, our books here say for a 97 landy use a 20 50 oil in meneral. So for synthetic you could run with a 5w 50 fully synthetic and cover you for everything from desert to snow. Synthetics are very stable in their viscosity compared to minerals, but either way it aint going to be cheap because you need about 7 1/2 litres according to the book here. Cheers BradMoo... everyone knows what a Jackaroo looks like :-)
AnswerID: 37908

Reply By: Member - DOZER- Thursday, Nov 20, 2003 at 21:09

Thursday, Nov 20, 2003 at 21:09
Ive been running Mobil1 for a while now, and do so because i keep the oil in longer and only use one filter instead of the usual 2 (2 changes).
This might not be the best idea of how to run synthetic oil, but it works for me, and the car does alot of cold starting/small trips to the school etc.
If you want to go back to mineral, the book says 15/40
Andrewwheredayathinkwer mike?
AnswerID: 37959

Follow Up By: Member - Bradley- Friday, Nov 21, 2003 at 16:45

Friday, Nov 21, 2003 at 16:45
Hey Doz, you can run most synthetics to longer oil intervals, but you should still change the filter every 10k as they can 'fill' up and go into bypass with as little as 7k depending on conditions. Our book showed early 97 as 20w50 and late 97 as 15w40. But with a good 5w50 like mobil1 orbleeps-supersyn you cant go wrong. Its the small trips and cold starts that kill any vehicle, so you need all the help you can get. Cheers Brad.

Ps. how many ks on the rig and how long have you run the synthetic ?Moo... everyone knows what a Jackaroo looks like :-)
FollowupID: 27604

Follow Up By: Member - DOZER- Friday, Nov 21, 2003 at 18:28

Friday, Nov 21, 2003 at 18:28
Mine has 280kms, and does alot of small trips. I use the Mobil 1 and change it once a year with the filter. It usually does about 12000kms in that time, but a mineral oil is recommended at 6 months/or x kms....I bought the cruiser with 240 on it a few years ago and didnt know what was ran in it b4 that, so i flushed it with wollies oil for a week, and then put the Mobil 1 in.
Andrewwheredayathinkwer mike?
FollowupID: 27609

Reply By: Chris (W.A.) - Thursday, Nov 20, 2003 at 23:07

Thursday, Nov 20, 2003 at 23:07
Pennzoil- expensive but better than the rest.Nice southerly coastal fishing trip someday.
AnswerID: 37978

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