Oil light on for a few seconds at cold start

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GearheadTool

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Well, the car seems to have the light on for a few seconds at cold start-up. This has me wondering just how heavy the oil put in by previous change was.

It goes out, stays out, runs fine.

Is this anything to worry about? Or should I change it ASAP?

*oh and cold start = first thing in the morning. Havent noticed it at subsequent starts during the day.
 
It hasn't been cold enough for even 20W50 to cause an oil light.

I would check the pressure sending unit.

Oh, and what kind of car/engine?
 
I wonder if the anti-drainback in the oil filter has failed.
If you haven't done an oil and filter change since buying the car, I'd do that. Do all the due maintenance, don't assume that anything is up to date, even if the seller said it was.
 
Originally Posted By: armos
I wonder if the anti-drainback in the oil filter has failed.
If you haven't done an oil and filter change since buying the car, I'd do that. Do all the due maintenance, don't assume that anything is up to date, even if the seller said it was.


+1 Sounds like a low end filter with a failed ADBV. I agree, give the car a once through and change the oil regardless using a quality oil and filter. Pennzoil Conventional and P1 filter is a great choice for just about everything
 
Originally Posted By: Bgallagher
...+1 Sounds like a low end filter ...


The car is an all wheel drive Volvo with a white block.

https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2754779#Post2754779

Don't automatically assume that a good quality name brand filter is not to blame. The S90 would do this with a mann filter, putting a Volvo filter on it fixed it instantly.

The MMO probably isn't helping either.
wink.gif
 
Originally Posted By: LargeCarManX2
Originally Posted By: armos
I wonder if the anti-drainback in the oil filter has failed.


Change the filter or just try a complete oil change and see if it solves the problem.


This is going to happen.

I know, I know.. FCP Groton.

This *WOULD* be the first car I have owned (friend owns) that NEEDED I repeat NEEDED an OEM filter. It was suggested for my Volkswagen but, we never got that far with it. (And I have always questioned the "It could be the oil filter" advice. Maybe this will change my mind?)

Oh, and I didnt put any Seafoam in the engine oil. Pint of MMO? Yes. Why? Because im changing it in a month or so...
 
I am also starting to wonder how sludged the engine is? Its running well, but the oil is darkening quickly.

Again: Topped up one quart Maxlife Nextgen (green bottle red label Maxlife) 5w30, one pint MMO. Nothing else. Can of Seafoam on 12 gallons of fuel.
 
Originally Posted By: OVERK1LL
You know that MMO reduces the viscosity substantially right?


*Substantially* ?

I thought it evaporated out the PCV!

16oz. MMO, 6 quarts engine oil...

For serious, though, I thought MMO was gentle, safe cleaning. Otherwise i would have never put it in. So, maybe ill get the oil changed sooner. Ill buy some ramps and tools...
 
I have always had the MMO burn off my sump if I get it up to operating temp for a long period of time, like an hr on the freeway.
 
Originally Posted By: GearheadTool
Originally Posted By: OVERK1LL
You know that MMO reduces the viscosity substantially right?


*Substantially* ?

I thought it evaporated out the PCV!

16oz. MMO, 6 quarts engine oil...

For serious, though, I thought MMO was gentle, safe cleaning. Otherwise i would have never put it in. So, maybe ill get the oil changed sooner. Ill buy some ramps and tools...


https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2405176#Post2405176

cSt @ 100C: 2.64
flash: 160F


Say you started out with a Pennzoil Ultra 5w30, which is 10.3cSt. You add 16 ounces of MMO (roughly 10%) and you end up with an oil that is 8.8cSt. You are now running a 20-weight
grin.gif
 
Originally Posted By: Brenden
I have always had the MMO burn off my sump if I get it up to operating temp for a long period of time, like an hr on the freeway.


MMO is 70% pale oil (as per the link I posted above). I'm sure the solvent component flashes off, but I imagine the effect that the base oil has on the viscosity of the oil in your crankcase is still present.
 
Originally Posted By: OVERK1LL
Originally Posted By: GearheadTool
Originally Posted By: OVERK1LL
You know that MMO reduces the viscosity substantially right?


*Substantially* ?

I thought it evaporated out the PCV!

16oz. MMO, 6 quarts engine oil...

For serious, though, I thought MMO was gentle, safe cleaning. Otherwise i would have never put it in. So, maybe ill get the oil changed sooner. Ill buy some ramps and tools...


https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2405176#Post2405176

cSt @ 100C: 2.64
flash: 160F


Say you started out with a Pennzoil Ultra 5w30, which is 10.3cSt. You add 16 ounces of MMO (roughly 10%) and you end up with an oil that is 8.8cSt. You are now running a 20-weight
grin.gif



Well if I am running a 20-weight.. Hmmm. I cant help but think the engine is eing more lubricated? I am still confused about what a Turbo does to the deal! (Engine oil temp.)

I will be changing this as soon as I can. Maybe i should order the FCP Groton Volvo OEM filter sooner rather than later..

And I STILL dont know if I have a 2.3 or a 2.4, though one of the posts seems to believe it is the 2.4. It got buried in a post flurry.
 
Originally Posted By: GearheadTool
Well, the car seems to have the light on for a few seconds at cold start-up.


Originally Posted By: GearheadTool
I am also starting to wonder how sludged the engine is? Its running well, but the oil is darkening quickly.

Again: Topped up one quart Maxlife Nextgen (green bottle red label Maxlife) 5w30, one pint MMO. Nothing else.


Originally Posted By: GearheadTool
Because im changing it in a month or so...


I was going to keep quiet, honestly . . . but this just says it all.

You just convinced a friend to buy a 12 year-old AWD turbo Volvo, as-is off a used car lot . . . knowing it was sludged up . . . dangerously overdue for a T-belt service on an interference engine . . . the ABS module has checked out, taking the speedo with it . . .

. . . and no one can even afford a decent oil/filter change out of the gate?

Well . . . at least the instrument panel is decorated early for Christmas.

https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2754779&page=all
 
Originally Posted By: OVERK1LL
Originally Posted By: GearheadTool
Originally Posted By: OVERK1LL
You know that MMO reduces the viscosity substantially right?


*Substantially* ?

I thought it evaporated out the PCV!

16oz. MMO, 6 quarts engine oil...

For serious, though, I thought MMO was gentle, safe cleaning. Otherwise i would have never put it in. So, maybe ill get the oil changed sooner. Ill buy some ramps and tools...


https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2405176#Post2405176

cSt @ 100C: 2.64
flash: 160F


Say you started out with a Pennzoil Ultra 5w30, which is 10.3cSt. You add 16 ounces of MMO (roughly 10%) and you end up with an oil that is 8.8cSt. You are now running a 20-weight
grin.gif


Hmm... maybe my math is off, but I got 9.7 cSt out of this calculation (192 oz of 10.3 cSt oil and 16 oz of 2.64 cSt oil).
 
Originally Posted By: GearheadTool
Originally Posted By: OVERK1LL
Originally Posted By: GearheadTool
Originally Posted By: OVERK1LL
You know that MMO reduces the viscosity substantially right?


*Substantially* ?

I thought it evaporated out the PCV!

16oz. MMO, 6 quarts engine oil...

For serious, though, I thought MMO was gentle, safe cleaning. Otherwise i would have never put it in. So, maybe ill get the oil changed sooner. Ill buy some ramps and tools...


https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2405176#Post2405176

cSt @ 100C: 2.64
flash: 160F


Say you started out with a Pennzoil Ultra 5w30, which is 10.3cSt. You add 16 ounces of MMO (roughly 10%) and you end up with an oil that is 8.8cSt. You are now running a 20-weight
grin.gif



Well if I am running a 20-weight.. Hmmm. I cant help but think the engine is eing more lubricated? I am still confused about what a Turbo does to the deal! (Engine oil temp.)

I will be changing this as soon as I can. Maybe i should order the FCP Groton Volvo OEM filter sooner rather than later..

And I STILL dont know if I have a 2.3 or a 2.4, though one of the posts seems to believe it is the 2.4. It got buried in a post flurry.


Well, turbo's spin at high speed and have very tight tolerances (and clearances). Adding anything to the sump that might negatively affect the lubricity that turbo sees would be a big no no for me.

And while having a 20-weight in there means that the oil will pump faster, it will also lower overall oil pressure. But since we don't know what your oil pressure actually IS, we don't know if that is a bad thing or not.
 
Originally Posted By: Quattro Pete
Originally Posted By: OVERK1LL
Originally Posted By: GearheadTool
Originally Posted By: OVERK1LL
You know that MMO reduces the viscosity substantially right?


*Substantially* ?

I thought it evaporated out the PCV!

16oz. MMO, 6 quarts engine oil...

For serious, though, I thought MMO was gentle, safe cleaning. Otherwise i would have never put it in. So, maybe ill get the oil changed sooner. Ill buy some ramps and tools...


https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2405176#Post2405176

cSt @ 100C: 2.64
flash: 160F


Say you started out with a Pennzoil Ultra 5w30, which is 10.3cSt. You add 16 ounces of MMO (roughly 10%) and you end up with an oil that is 8.8cSt. You are now running a 20-weight
grin.gif


Hmm... maybe my math is off, but I got 9.7 cSt out of this calculation (192 oz of 10.3 cSt oil and 16 oz of 2.64 cSt oil).


You used the 8.3% MMO instead of my roughed-up 10% figure eh? LOL
wink.gif


I used Widman's calc: http://www.widman.biz/English/Calculators/Mixtures.html

If you plug in 10%, you get the number I cited.
 
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