Which 15w40?

[favilac]

One is a well respected conventional, and the other is an HDEO (CJ4/SM)(B). Price about the same.

Spec / Conventional / HDEO

Vis40 / 108.1 / 109
Vis100 / 14.9 / 14.4
Flash P. / 237 / 207
Pour P. / -30 / -36
VI / 143 / 142
TBN / NA / 10

The vehicle is a 97 Blazer with over 210K miles.
Most of the time is small city driving with a temps in the 60-100 range.
There is some highway driving that includes mountain roads and desert stretchs (temps over 120F, easily).

The car only burns oil in spirited highway driving.

 

[A_Harman]

The conventional. I'm just not a fan of putting HDEO's in gasoline engines.

I would ask what's wrong with using a 10w30 conventional, but since you run the truck in up to 120F ambient, a 40-weight is probably a good choice.

How much oil does the engine burn?

 

[UltrafanUK]

Some car HM oils like Castrol GTX are 15w40, BUT the trick with any modern truck or car is to USE THE OIL FINDER OR GUIDE page of a major brand oil company, like Mobil, Castrol, Shell (Penn) or Liqui Moly (Fuchs base stock).

The most accurate oil guide is the Liqui Moly one and I'm saying that as an Ultra fan:
http://www.liqui-moly.com/liquimoly/web.nsf/id/pa_eng_oil_guide.html

LM list of 0w30 to 0w40 oils:
http://www.liqui-moly.com/liquimoly/web.nsf/id/pa_eng_oil_guide.html

Mobil:
https://mobiloil.com/en/product-selector

Casteroil:
http://applications.castrol.com/oilselector/en_us/c/search

Shell:
http://www.shell.com/motorist/find-the-right-oil.html#iframe-Lw==

 

[BrocLuno]

I been doing the HDEO thing on motors over 150K for decades. The motors go well into the 300K range. I'd try Delo400 and see how it runs... If all is good, you're golden. If there are some weeps and drips, maybe switch to Maxlife 10W-40. The Chevy motor has opened up some clearances in 210K

 

[CT8]

Any major brand oil of your choice will work well. HDEO or conventional will be fine.

 

[favilac]

The conventional is Mobil Super 5000, and the HDEO is Autozone brand made by WPP.

It burns over a quart in a 1,200 miles trip that includes a climb over 4,200ft from sea level, but most of it is the sonoran desert.

I also have access to Chevron Supreme 10w40 really cheap at Costco.

 

[HerrStig]

T6, it's better than "conventional".

 

[yvon_la]

get the valvoline at walmart ,it is rated cj-4/sn!and it isnt synthetic so it should do well for your engine

 

[SavagePatch]

Originally Posted By: BrocLuno
If there are some weeps and drips, maybe switch to Maxlife 10W-40.


Good advice. Perhaps the new Maxlife Heavy Duty 15w40 (CJ4/SN) available at WalMart would be the best of both worlds.

 

[favilac]

Guys, I live in Ensenada, México

No PYB and no Rotela.

I have only seen Maxlife in 5w30 lately, no 10w40.

 

[SavagePatch]

Originally Posted By: favilac
Guys, I live in Ensenada, México

No PYB and no Rotela.

I have only seen Maxlife in 5w30 lately, no 10w40.


The Maxlife 5w30 is a good choice too if that's all you have available.

 

[Gene K]

Assuming it's a 4.3L the Blazer will do well on the Autozone WPP 15W40. My Aunt had a 4.3L that went 700,000 km before she sold it and is now approaching 800,000 km and has had Rotella and Supertech (WPP) 15W40 for the last 500,000+ km.

 

[Gene K]

Assuming it's a 4.3L the Blazer will do well on the Autozone WPP 15W40. My Aunt had a 4.3L that went 700,000 km before she sold it and is now approaching 800,000 km and has had Rotella and Supertech (WPP) 15W40 for the last 500,000+ km.