Toyota’s stance on using a heavier weight oil

[thastinger]

I discovered that MMO worked remarkable well as a power steering fluid in my '98 K1500. I had leaky lines and the reservoir ran dry one time. I didn't have any power steering fluid on hand but had a couple bottles of MMO on the shelf collecting dust so in it went. Ran that for awhile before finally sucking it all out and replacing it with Valvoline MaxLife power steering fluid. Between the two of those, no more leaks since. So win?

The stuff is fantastic, not well respected here but the same people who poor mouth MMO for not having ingredients that show up on a VOA are the champions of Valvoline Restore and Protect...which also shows nothing special on a VOA.

 

[kschachn]

The stuff is fantastic, not well respected here but the same people who poor mouth MMO for not having ingredients that show up on a VOA are the champions of Valvoline Restore and Protect...which also shows nothing special on a VOA.

Actually it is the stuff that does show up on an SDS which is telling. That VOA wouldn't show anything.

 

[ZeeOSix]

“Tighter engine tolerances require thinner oil”. If this was true, how is it possible that Australian owner manual has oils 0w-16, 0w-20, and 5w-30 for the same engine? Where is the logic?

If people say anything about the connection between journal bearing clearance and the impact of oil viscosity on the MOFT, it should be more along the lines of: "Larger bearing clearances need thicker oil to maintain film thickness".

Tight bearings will still produce more MOFT as the oil viscosity increases, but as the clearance increases, it's harder for the bearing to maintain MOFT and will actually start loosing film thickness unless thicker oil is used. This is why many engines can specify a whole range of viscosity like xW-20 to xW-50 if CAFE isn't making a manufacture only recommend the thinnest oil possible. Increasing the viscosity is always going to provide more MOFT. That's a basic physics result of an oil film between two moving parts.

 

[97K15004WD]

People like SUV’s as long as gas is cheap.

What I quoted is missing words - what words!?!

 

[ZeeOSix]

Everyone knows Australia works differently though, have you seen their toilets flush?

All the journal bearings rotate in the opposite direction too ... specially built engines.

 

[ZeeOSix]

Just fill the crankcase with MMO, it is at least as thick as 0-8

Searching this comes up with MMO around KV100 of 2 to 3 cSt, so quite a bit thinner. I bet someone has ran an engine on pure MMO like some click-bait YouTubers have ran engines on all kinds of stuff like pure WD-40 etc. Looks like WD-40 also has a KV100 around 2.5-3 cSt. The car the YT's ran on pure WD-40 lasted a lot longer than I'd think, but it did finally blow-up with massive abuse.

 

[JunkdrawerDog]

In the early 70s, my winter blend was 4 quarts of 10w-30 and 1quart Marvel Mystery Oil. Worked for sub zero starting temps.

 

[JackWildfeuer]

My Mom and dad had something like 5 or 6 free oil changes at the dealership for their new Rav 4 when they purchased it. To make a long story short they where not having 10,000 mile oil change or 1 year OCI. So when the oil would hit 5000 miles dad would drain the oil and refill with Mobil 1 5W30. They would then return to Toyota at 10,000 miles for the free oil change.

Once those 5 or 6 oil changes where done dad just went to 5000 mile OCI and Mobil 1 5w30 and Valvoline Restore and Protect 5W30 and has not looked back. They live in Arizona and have not seen any reduction in fuel ecconomy going to synthetic 5W30!

 

[ARB1977]

Those tight clearances must not be that tight after all

That’s what she said.