Chevron esi 80w-90... flush

[thejudges69]

I currently run Chevron esi 80w90 in all my gear boxes. I'm thinking of going to a full synthetic, maybe a 75w-90 or 75w-140. I spoke to Chevron about this oil and was told by their tech cause it contains a special additive package including boron, he wouldn't elaborate stating it's proprietary. He stated I can't just drain an fill, they said I need to drain, fill with a straight 80w-90, drive it 20-30 miles, then drain and fill with preferred oil. I can't find anything to support this, and if I don't have to spend the money for extra oil just to flush, I don't wanna.

So is a flush required after this oil drain?

 

[PiperOne]

NO. Hot drain and then re-fill. Was this information from a local sales guy or their 1-800 tech line?

 

[4WD]

Well … recently drained the factory fill from the front end of our Tahoe and filled with Delo XDM
(Hydro cracked lube)

Guess I missed a step … will probably run it just 20k and dump since the break in oil had lots of fine metal

https://www.chevronlubricants.com/en_us/home/products/delo-syn-gear-xdm-sae-75w-90.html

 

[thejudges69]

Chevron's 1800 tech line. Local sales guy said drain and fill. I don't need to be burning up rears and a transmission over a couple hundred dollars in oil.

 

[zeng]

This ESI 80W90 contains Boron ,is a GL5 MT-1, J2360 'monograde' and has Meritor and Mack OEM approvals.
I wouldn't swap it to others in terms of performance or components protection, whether or not your particular application requires it.
No, flush is unnecessary.

 

[PiperOne]

Well, we used to use the Delo ESI and we switched to XDM.....still waiting for the explosions from not doing a flush. The PDS for XDM specifically talks about compatibility with other oils syn or mineral.

 

[4WD]

Originally Posted by PiperOne
Well, we used to use the Delo ESI and we switched to XDM.....still waiting for the explosions from not doing a flush. The PDS for XDM specifically talks about compatibility with other oils syn or mineral.


Yeah ... I have a quart of each and will probably run 75/25 next change since the front only holds 1.5 quarts ...

 

[thejudges69]

Originally Posted by zeng
This ESI 80W90 contains Boron ,is a GL5 MT-1, J2360 'monograde' and has Meritor and Mack OEM approvals.
I wouldn't swap it to others in terms of performance or components protection, whether or not your particular application requires it.
No, flush is unnecessary.


I'm due for a change. The oil has around 250k. I'm paying a lot for the oil. And I think I can change brands and go full synthetic for the same price. It cost me about $550.00 to change both rears and transmission. It hasn't gave me issues, it has brought my temps down drastically, to a point it almost makes ya wonder if the sensors are working.