Engine Oil Grades

Submitted: Monday, Jun 30, 2003 at 00:56
ThreadID: 5732 Views:2808 Replies:4 FollowUps:1
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OK, I've been using Penrite HPR Diesel 20W60 for the last 3 oil changes, and after doing more research feel that it's probably not the right product to be using. Basically to thick. My question is does my engine now want this oil or same grade? Has it "worn" to the thicker oil, and thus too late to change to a 15W40 grade oil?

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Reply By: Hughesy - Monday, Jun 30, 2003 at 04:29

Monday, Jun 30, 2003 at 04:29
Lyndon, I used Penrite HPR in a T/D Rodeo I once owned because the oil pressure dropped when driving long distances on the highway cause of the heat from the turbo (on the oil). But realised that the wear caused by the long time taken to build up oil pressure at engine start up wasn't worth it. It would be suitable for an older engine with a low oil pressure problem (i think penrite even make a 20W70 for them oldies) or a vehicle that was driven all day in hot climates and not stop and start (like an outback postie).

Changing over to a different oil of different grade won't cause any problems. If you want to be over cautious change the oil and filter, run the car for a 100 odd km's and then change oil and the filter again, this would flush out any of the old oil (and leave your engine nice and clean). I use Castrol RX now (in a cruiser) and couldn't be happier with it. You will notice a change in oil pressure readings if you have a oil pressure gauge in the 4B.

Hope this is of help.
AnswerID: 23815

Reply By: Will - Monday, Jun 30, 2003 at 18:47

Monday, Jun 30, 2003 at 18:47
Lyndon what type of vehicle and engine is fitted
A 20W 60 is far to heavy for a current model diesel
AnswerID: 23876

Follow Up By: Lyndon - Monday, Jun 30, 2003 at 20:29

Monday, Jun 30, 2003 at 20:29
It's a 12HT cruiser
FollowupID: 16017

Reply By: Phil G - Tuesday, Jul 01, 2003 at 23:12

Tuesday, Jul 01, 2003 at 23:12

Just change back to the correct grade oil for your 12H-T which is 15W40.
AnswerID: 24012

Reply By: David N. - Saturday, Jul 05, 2003 at 09:35

Saturday, Jul 05, 2003 at 09:35
Also there is a huge difference depending on whether you live in Cairns or Tasmania- or in between.
Heavy oil in a cold climate is bad news- especially for cold engine starts.
AnswerID: 24254

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