Volunteer Firefighter - Oil Recommendation Needed

[Shannow]

CATERHAM,
again, under those conditions, the oil that is there is quite high in viscosity, and keeping the parts apart in hydrodynamic regimes.

There's PLENTY of oil on the cylinder walls, and being viscous, it's providing a high degree of hydrodynamic lubrication...

The oil that gets to the cams via side leakage from the cam bearings will be similarly viscous, and if sprays are involved, the higher oil pressure of the 5W will actually be supplying MORE oil, for e.g. the squirters on my old BMW 323 were sharp edged orifices, pressure density devices.

You (and University 101) have this fixation on the ideal viscosity being "10" at all points and temperature in an engine...were you to get your dream oil, you would need a whole lot of new AW/FM ads that were functional down to -40C.

This is reflected in the Sequence IVA wear test, the industry standard, which has the right degree of viscosity loss and additive action to be the sweet spot for cam wear...and guess what, the oil is ALL there and "flowing" for the test.

If the point you are making is true, then high VI 20s would show marked superiority in these tests and there would be papers that YOU could reference to show them.

4 or 5 years of the same old talk, and you've presented nothing to defend your premise of lower vis oils providing greater cam (or cylinder) protection during warmup, cold start, or anywhere.

If you've got them, please post them.

 

[Shannow]

Here's what the heat input into engine oil on a cold start and early operation comes from due to viscous shear.

In the test engine, it included piston skirt friction.

Clearly, the oil is between these high speed surfaces, and is quite thick...

The Japanese OEMs state that this is the region that they are targetting with uber high VI oils, the frictional drag during warmup...and their stated reason is economy improvement...that's THEIR claim in THEIR papers. (I know you've got a pece from an advert from Nippon oil that it's to protect engines from "failing" in stop start, but that's advertising fluff).

While in this space, here's another extension to the topic.

Oil temperature rise is more influenced by RPM than load, both in steady state, and in early operation...pertinent to the OP's operational situation.

 

[CATERHAM]

Originally Posted By: Shannow

There's PLENTY of oil on the cylinder walls, and being viscous, it's providing a high degree of hydrodynamic lubrication...

The oil that gets to the cams via side leakage from the cam bearings will be similarly viscous, and if sprays are involved, the higher oil pressure of the 5W will actually be supplying MORE oil, for e.g. the squirters on my old BMW 323 were sharp edged orifices, pressure density devices.

You're wrong and you've always been wrong. I'm just tried of arguing with you.
The lighter the oil, the more oil that makes it's way onto the cylinder walls etc and through the piston squirters. The fact that the oil back-pressure drops as the oil heats up during warm-up is due to the declining resistance to flow of the lowering oil viscosity not decreased flow as you suggest. I know you're not stupid but why this basic principal of viscosity seemingly escapes you is beyond me.

 

[bobbydavro]

The lighter the oil. The quicker it runs off the cylinders. Also the thinner the oil film for the rings to surf along.

Also lighter oils mean reduced oil pressure. So the lower viscosity has an effect of flow rather buy also keep in mind that it has less force (delta P) driving the oil out of the jets.

To be honest the main issue with cold oil in the chemistry not working rather than it being too thick.

 

[Shannow]

Originally Posted By: CATERHAM
You're wrong and you've always been wrong. I'm just tried of arguing with you.


You can't say that I haven't offered to let you teach me by asking for anything technical that you have to support your posits.

Every time, we only hear the chirping of crickets..then you go off and say the same stuff in another thread.

Again...show me...

 

[roastpuff]

Originally Posted By: Garak
I haven't seen it regularly yet, but NAPA Canada has it, at least in 60 litre kegs.


That's a little too much oil for me, I'd take years to use it all up!

Originally Posted By: dlundblad
I would just use Pennzoil conventional.


PYB, or gold bottle or something else?

Originally Posted By: jacobsond
30yr volunteer firefighter here.1/2 of that as chief. Slow yourself down is what I would recommend. Had that talk with my guys once or twice a year.Kind of a race to the fire hall? I hope you are kidding. That wouldn't fly on our department.Sheriffs dept has our blessing to issue tickets for that. Young guys were the worst us older guys have mostly got it figured out. The seconds you might save getting to the hall might also be the life you take rushing. Now as far as oil I don't know. What about those big fire trucks from cold to go without any warm up? Stay safe my friend.You have to get to the incident to help,sometimes that may take a little longer to be safe.


Yes, our chief has had to give a few members warnings... and the RCMP around here do stop us if we speed to the hall. I will try to keep it under control, but still interested in whether or not I would see increased wear from the cold start + no-warm up time.

Our trucks are always plugged in when in the hall, whether it's summer or winter. So I guess the block/pan heaters help?

Originally Posted By: SlipperyPete
Don't give it a second thought, unless other FF's are complaining about having blown up motors previously.


No one's complained of issues... That I know of. But one of the guys did have to get his diesel HD Ram engine rebuilt recently, it's a 2005 and I don't know if fire call responses have any part to play in it.

 

[Garak]

Originally Posted By: roastpuff
That's a little too much oil for me, I'd take years to use it all up!

Yes, it is quite a bit of oil, but I'm sure it'll start showing up in more sensible containers. If you really wanted it, and felt like perusing a few smaller parts stores, you might come across it. Perhaps NAPA Canada does already have it in smaller containers, but just hasn't publicized that.