LE 1605 vs. Amsoil Severe Gear 75w110
07-28-2010, 01:57 AM
#31
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If I were to choose a Delo gear oil, I would go with the ESI 85W-140. I like conventional gear oils in rear diffs because I think they really are safer for seals and they stay on the gears better than synthetics. I know I'm not supposed to think like that, but I still do.
As far as multi-viscosity 75W-90 and 80W-90 gear oils go, most are formulated on the very low end of the old (pre-J306) SAE 90 scale. And then they shear below grade. I think that's what Spitfire was trying to tell you. The manuals have never been updated for any lubricant recommendation that I'm aware of. This is not unusual, since the car hasn't changed much, and updating manuals costs money.
As far as multi-viscosity 75W-90 and 80W-90 gear oils go, most are formulated on the very low end of the old (pre-J306) SAE 90 scale. And then they shear below grade. I think that's what Spitfire was trying to tell you. The manuals have never been updated for any lubricant recommendation that I'm aware of. This is not unusual, since the car hasn't changed much, and updating manuals costs money.
07-28-2010, 09:36 AM
#32
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INDYMAC Posted on Jul 28 2010, 10:57 AM
No I wasn't 
Oh wait..
Yes I was.
Honda did update the older manuals in regard to the sparkplug recall.
They gave me a self adhesive label with the new sparkplug part # to be put over the old one.
They could (should IMO) have done the same with the diff oil.
Btw.. the SAE J306 spec changed in 2005 and it still called SAE J306
As far as multi-viscosity 75W-90 and 80W-90 gear oils go, most are formulated on the very low end of the old (pre-J306) SAE 90 scale. And then they shear below grade. I think that's what Spitfire was trying to tell you.
Oh wait..
Yes I was.
The manuals have never been updated for any lubricant recommendation that I'm aware of.. and updating manuals costs money.
They gave me a self adhesive label with the new sparkplug part # to be put over the old one.
They could (should IMO) have done the same with the diff oil.
Btw.. the SAE J306 spec changed in 2005 and it still called SAE J306
07-28-2010, 02:30 PM
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INDYMAC, I'm another that thinks synthetics aren't automatically better than everything else. If you aren't pushing the extremes of temperature or going for an abusively long drain interval, I see no reason why a mineral oil won't perform amazingly well ... and have seen engine oil UOAs to back this up.
Hmmm ... I'm tempted to get the Chevron Delo 75W-90 gear oil and leave it in for a fairly short interval (two years - 6,000 - 8,000 miles est.) and have it tested for shear and general wear indicators. I'm reasonably sure my '05 has the original gear oil in it (it's got less than 15,000 miles on the odo) so it might not be a bad idea to "flush it" with a (relatively) short interval.
Or, I could get both weights and fill the diff with a 50/50 mixture of the two. to get something like a 75W-115.
Yes ... I'll definitely get a pump as there's not enough room above the diff to tilt the bottle for filling.
Hmmm ... I'm tempted to get the Chevron Delo 75W-90 gear oil and leave it in for a fairly short interval (two years - 6,000 - 8,000 miles est.) and have it tested for shear and general wear indicators. I'm reasonably sure my '05 has the original gear oil in it (it's got less than 15,000 miles on the odo) so it might not be a bad idea to "flush it" with a (relatively) short interval.
Or, I could get both weights and fill the diff with a 50/50 mixture of the two. to get something like a 75W-115.
Yes ... I'll definitely get a pump as there's not enough room above the diff to tilt the bottle for filling.
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