2000 td5 w/ lt230 & r380 penrite oil question

**Isaac12277** · 19th October 2016, 09:30 PM

Hey all,

I know this has been done to death and a few veterans will be bashing their head as if they've seen another 235/255/285 tire debate but i've read the good oil on the forum and come out the other end just as indifferent.

I've got some penrite progear full synthetic 75w-90 oil for the lt230. Will this be alright for the R380 as well? I've been recommended this by a trusted shop but everywhere I read say don't go more than a 75w-85 in the r380 for the oil pump's sake. I've just been thrown off by the advice of the shop thats been nothing but knowledgable and helpful the past year. Won't hurt me to use the second bottle for the front diff if they're off. Getting vey mixed reviews on what to put in the rear Sals as well, any advice on a penrite oil for this would be awesome.

Thanks in advance,
Isaac.

**Defender boy** · 19th October 2016, 09:53 PM

Hi mate, the 75/90 will be fine in the R380 and as for the Salisbury I run Penrite gear oil 85W 140 but I know a lot of blokes run Penrite gear 80W 90. They both do the job fine.

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**isuzurover** · 20th October 2016, 01:30 AM

Originally Posted by Defender boy

Hi mate, the 75/90 will be fine in the R380 ...

Sorry, but no it won't. The viscosity of the Penrite 75W90 is 6x higher at -40, 2x as high at 40oC and about 50% higher at 100oC - compared to oils like Castrol Syntrans and MTF94 (OE Spec).

Basically it is too thick.
It would be fine for the t-case and front diff, but probably a waste of money.

The Sals runs hot (hypoid gears) so it is best to put 85W140 in it.

**Isaac12277** · 20th October 2016, 06:12 AM

Originally Posted by isuzurover

Sorry, but no it won't. The viscosity of the Penrite 75W90 is 6x higher at -40, 2x as high at 40oC and about 50% higher at 100oC - compared to oils like Castrol Syntrans and MTF94 (OE Spec).

Basically it is too thick.
It would be fine for the t-case and front diff, but probably a waste of money.

The Sals runs hot (hypoid gears) so it is best to put 85W140 in it.

Thanks mate, why a waste of money to put in the transfer and front diff? From all accounts i've heard 75-90 is good for the transfer or do you mean a more inexpensive oil would be a better idea for this?

Thanks again,
Isaac.

**harro** · 20th October 2016, 08:05 AM

Originally Posted by isuzurover

Sorry, but no it won't. The viscosity of the Penrite 75W90 is 6x higher at -40, 2x as high at 40oC and about 50% higher at 100oC - compared to oils like Castrol Syntrans and MTF94 (OE Spec).

Basically it is too thick.
It would be fine for the t-case and front diff, but probably a waste of money.

The Sals runs hot (hypoid gears) so it is best to put 85W140 in it.

In addition to the above the Penrite 75w-90 is a GL5 rated gear oil.
The R380 requires a GL4 so ok for diffs and T/c but not for the box.
Penrite do a 70w75 GL4 and a 75w85 GL4 both considered suitable for the R380. Depending on who you talk to

FWIW I run Redline MTL and it is the best lube I have had in the box.

Paul.

Tombie · 20th October 2016, 08:18 AM

The answer was as simple as looking at the Penrite page:

**Isaac12277** · 20th October 2016, 09:04 AM

Originally Posted by Tombie

The answer was as simple as looking at the Penrite page:

Yes thanks mate I have done this...and will follow this. What threw me off was a very reputable and trusted shop who have not yet led me astray, pointing me elsewhere and thought it would not hurt anyone to run it by the forum as with many things I see people can often find better alternatives to suit the conditions we are in outside of the factory recommendations.

Take it easy,

Isaac.

Tombie · 20th October 2016, 09:44 AM

All good Isaac...

**isuzurover** · 20th October 2016, 11:37 AM

Originally Posted by Isaac12277

Thanks mate, why a waste of money to put in the transfer and front diff? From all accounts i've heard 75-90 is good for the transfer or do you mean a more inexpensive oil would be a better idea for this?

Thanks again,
Isaac.

It is the right grade of oil and won't do any harm, however the front diff and t-case are not prone to excess wear, so less expensive non-synthetic EP80W90 will be fine.

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