Thread: Oil Question Again

Originally Posted by Graeme

If only we knew that 5W30 was specified rather than 5W40 purely for fuel economy reasons....

Rick130 may have some idea?

Originally Posted by Graeme

If only we knew that 5W30 was specified rather than 5W40 purely for fuel economy reasons....

That is always the question. My gut says "yes; but". Like the American march towards water thin oils to meet CAFE requirements, all manufacturers are having to toe the line. On the other hand, they're also having to improve machining tolerances and bearing materials to allow these water thin lubricants to actually work for long enough to satisfy warranty requirements.

Manufacturers like Toyota and Honda seem to be on top of this, but as Landrover seem to have a propensity for trashing bearings/cranks I don't think they've got it right. I'm taking a completely WAG (wild arsed guess) gamble on 5w40 and I'm willing to wear the consequences. Nobody knows if it'll help or make things worse because nobody has ever done a controlled test, so we're all guessing. Manufacturers wouldn't be spending the money for thinner oils and risking warranty failures if there wasn't a payoff.

In my old tractor (2.3L iron block I4 Volvo engine) I did detailed fuel consumption tests over 36 months. I did a 20w50, 5w40 and 5w30. I ran each for a year and logged every tank. There was a measurable difference with each in fuel consumption. Enough to rule out "margin of error", but not enough for me to choose the 5w30 over 5w40 that everything else I drove used.

I was pleased to find a year or so ago that a new to me 2012 header fitted with a modern high performance industrial engine uses the same 15W40 engine oil that everything else of mine uses. Header engines run at full rated revs all the time.

Originally Posted by BradC

I was seeing a fairly consistent sump temp of ~121C pulling the van home from Albany yesterday. If that's sump temp, then the oil temp in the bearing is going to be "quite a bit warmer". I was doing some work with a guy a few years ago who put thermocouples under the main shells to measure the oil spilled directly from the bearings and he was clocking more than a 20C difference between the crank and sump temps.

Wonder what the difference in KV and HTHS is at 150C?

Easy enough to check, just plug the numbers into a viscosity index calculator. Flick 'em through if you'd like.
HTHS is measured at 150*, in our engines anything above 3.5 will give adequate protection.

Originally Posted by Graeme

If only we knew that 5W30 was specified rather than 5W40 purely for fuel economy reasons....

Here is my take/thoughts on that question
Discovery TDV6 Oil specs explained and compared to current oils - YouTube

Originally Posted by BradC

Manufacturers like Toyota and Honda seem to be on top of this

As a comparison,all our Tojos are serviced at the dealer,Diesels run 0w30,including 1VD-FTV in the LC200.
Petrols all run 5W30.
Many have done huge mileage with no issues.
None ever used oil either.

FWIW,the F33A-FTV in the LC300 runs 0W20.Time will tell how it goes in the long run, i suppose.

Quite a few on the LC forums run 5 or 10W40 in the 1VD,particularly up north in hotter regions,and those that tow the big weights most of the time.

I'll be moving to the -913D spec'd Castrol Magnatec Stop-Start 5W30 A5 with my next 20L drum purchase to be used in both my old 3.0 TDV6 D4 that belongs to one of my sons and my 4.4 TDV8 L322, prompted by Shane's charts.

Originally Posted by dirvine

This thread has gone way off what I originally asked. I dont care what oil people put in their engines. I just asked if there was any difference between 2 types of Penrite oil. The question was basically answered after the 4th or 5th post. If I had the power I would shut the thread down as it has gone way off track. Moderators???

It was quite rightly pointed out to me recently that any control of peoples opinions be it relevant or not would go against the spirit of AULRO...

Originally Posted by Tins

Threads go where they go. They always do, Nobody owns them, as much as some want to.

I introduced the TDV8 to this one in a serious attempt to help. I don't know if it's easy or difficult, but the OP is faced with either a huge repair bill or a huge loss, so any option should be on the table. Sorry if that upsets some ( not really ).

Only the OP can know if the thread has contained info helpful to him. Who knows what he has gleaned from it? HE does, not you, and not me.

Any attempt to control what people post, or what direction a thread takes, would fly in the face of the spirit of AULRO, and IMO would be an abuse of power. This thread will die a natural death, as they all do. If the OP has gained anything from it then it has been worthwhile.

BTW, the sentiments expressed by some here is exactly why I tried to get a Sticky going in TGO for D3/4 engine swaps ( ok, 2.7, but no reason it couldn't expand to 3.0 ), but nobody complaining here seemed to be interested in having a central place to seek info without the digressions. Well, except for Dazza.

My two bob is worth the same as the next bloke's, and there it is.

Originally Posted by DazzaTD5

I do believe you are right in everything you say...
it would be as you say not in the spirit of AULRO to control or delete comments, regardless of how irrelevant it might be. I retract my previous thought (but not deleting the comment)

Yes I do love a good sticky, full of info and fact without all the BS

As I stand corrected...