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Engine Oil - A slippery subject Part 2

3505 messages, Last post on Mar 18, 2009 at 6:13 PM

You are in the Maintenance & Repair Forum. Your Host is mr_shiftright

What is this discussion about? Engine, Oil

Outline

Messages Page 346 of 351: 1; ...; 343; 344; 345; 346; 347; 348; 349; ...; 351; Prev; Next; Last

#3446 of 3505 Re: Oil Pressure Blues update #2 [jeffyscott] by texases Mar 25, 2008 (10:43 am)
Replying to: jeffyscott (Mar 25, 2008 10:37 am) You sure have some confusing symptoms. The few cars I've experienced with low oil pressure from worn out bearings, etc, were pretty much low all of the time. Makes me wonder if there might be a problem with the high oil pressure relief valve - don't VWs have that? Maybe the spring is weak? Replies to this message: jeffyscott (Mar 26, 2008 4:37 am)
#3447 of 3505 Re: QUESTION! [shipo] by Mr_Shiftright HOST Mar 25, 2008 (10:45 am)
Replying to: shipo (Mar 25, 2008 9:19 am) yes it is probably more perception than science---but then, understandable in a way. I often here more cautionary tales from people who deal in $15,000--$30,000 engine rebuilds than one might from someone selling Chevy crate engines for $3,500 out the door. Greater risk often induces greater cautionary procedures I guess. Also the Porsche requires periodic services that seem to work against extended oil changes...more like "well as long as the car is up on the rack for its major service, why not?"
#3448 of 3505 Re: QUESTION! [Mr_Shiftright] by roadburner Mar 25, 2008 (11:07 am)
Replying to: Mr_Shiftright (Mar 25, 2008 6:25 am) I agree with Shipo. He's seen the Mobil 1 0W-40 UOAs from the M54 motor in my wife's X3. For some reason that particular engine depletes the additive packages in less than 9000 miles, yet the viscosity remains within spec. Replies to this message: shipo (Mar 25, 2008 1:26 pm)
#3449 of 3505 Re: Oil Pressure Blues update #2 [jeffyscott] by shipo Mar 25, 2008 (1:17 pm)
Replying to: jeffyscott (Mar 25, 2008 10:37 am) "Also my thinking is if the pressure loss is that intermittent and infrequent (only at idle and only when engine is hot), it's likely the parts are still remaining pretty well lubricated, since the oil that is on the parts would not disappear the instant that pressure is lost." I think that it is important to point out that just because you have low oil pressure, that in no way means that you have low oil flow. Question: Does your car have an oil filler hole that allows you to see part of the valve train? If it does, what do you see when you open it up with the engine up to operating temperature and at idle? If you see oil splashing around, then I'm of a mind to say that you needn't worry, however, if it's dry up there, then discovering the source of your problem might be worth the effort, especially if the car spends a lot of time idling. Best Regards, Shipo
#3450 of 3505 Re: Oil Pressure Blues update #2 [jeffyscott] by shipo Mar 25, 2008 (1:23 pm)
Replying to: jeffyscott (Mar 25, 2008 10:37 am) And another thing! I just ran across the numbers for the "new" Castrol Syntec 20W-50; apparently at 100 C it has a cst of a whopping 19.7. You might want to try and get your hands on some of that stuff. Best Regards, Shipo Replies to this message: jeffyscott (Mar 25, 2008 1:36 pm) shipo (Mar 25, 2008 1:49 pm) jeffyscott (Mar 26, 2008 4:43 am) and 2 more... jeffyscott (Mar 28, 2008 4:32 am)
#3451 of 3505 Re: QUESTION! [roadburner] by shipo Mar 25, 2008 (1:26 pm)
Replying to: roadburner (Mar 25, 2008 11:07 am) Kind of amazing how long the legs are on the "Oil shears down to its base oil" conventional oil factoid/myth (at least as far as PAO based synthetic oils are concerned). Best Regards, Shipo
#3452 of 3505 Re: Castrol 20w-50 by jeffyscott Mar 25, 2008 (1:36 pm)
Replying to: shipo (Mar 25, 2008 1:23 pm) But pennzoil 15W-50 is higher, 21.4 cst 100 Replies to this message: shipo (Mar 25, 2008 1:49 pm) jeffyscott (Mar 26, 2008 4:43 am) shipo (Mar 26, 2008 5:34 am) and 1 more... jeffyscott (Mar 28, 2008 4:32 am)
#3453 of 3505 Re: Castrol 20w-50 [jeffyscott] by shipo Mar 25, 2008 (1:49 pm)
Replying to: jeffyscott (Mar 25, 2008 1:36 pm) Ahhh, my bad, I thought that I read that the Pennzoil was in the high teens. Best Regards, Shipo Replies to this message: jeffyscott (Mar 26, 2008 4:43 am) shipo (Mar 26, 2008 5:34 am) jeffyscott (Mar 27, 2008 4:33 am) jeffyscott (Mar 28, 2008 4:32 am)
#3454 of 3505 Re: Oil Pressure Blues update #2 [texases] by jeffyscott Mar 26, 2008 (4:37 am)
Replying to: texases (Mar 25, 2008 10:43 am) The few cars I've experienced with low oil pressure from worn out bearings, etc, were pretty much low all of the time. From what I have read it would be normal to see low pressure only at higher temps, when oil is less viscous and thus leaks out faster. But, to clarify I think the pressure on this car is lower than it is supposed to be all the time, when the oil is hot. However, it is only infrequently going to 0. I'm not sure about pressure releif valve. The diagram we have shows one, but then it says "not applicable from 8/95".
#3455 of 3505 Re: Castrol 20w-50 [shipo] by jeffyscott Mar 26, 2008 (4:43 am)
Replying to: shipo (Mar 25, 2008 1:49 pm) No problem. We will take a look at what we see with oil cap off. "Valve train" is the shiny metal that you see through that hole with the oil cap off, right? Perhps a good sign is that the fitting at the temporary guage on the windshield started leaking a bit and the back of the mirror is now pretty well lubricated. Replies to this message: shipo (Mar 26, 2008 5:34 am) jeffyscott (Mar 27, 2008 4:33 am)

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