Oil Unknown-Any Guesses By Add Pack?,Low Miles?,01 1.8 Sentra

[jeremiah2360]

Sorry for the long title(and post). My father just bought another Sentra from a Saab dealer and according to the owner`s service records in the glove box this oil should have 4,266 miles on it,42,266 miles on vehicle. The analysis suggests it probably was changed at the dealership

According to the records it was last changed at a Midas muffler place and was expecting a Dino 5-30 type report. Interesting add pack,any guesses what it is? Hope the high Sodium is just part of the oil`s add pack and not anti-freeze. Just wanted make sure the engine was healthy and no head gasket leaks or anything. Looking under the oil fill cap the motor was spotless so whoever had it took good care of it.

Iron--------9
Chromium----1
Lead--------1
Copper------8
Tin---------0
Aluminum----2
Nickel------0
Silicon-----9
Boron-------43
Sodium------195
Magnesium---69
Calcium-----2148
Barium------0
Phosphorus--1010
Zinc--------1272
Molybdenum--116
Titanium----0
Vanadium----0
Potassium---0

Fuel-------- Vis @ 100 C-12.86
Water-------0
Soot--------N/A
Glycol------NEG

TBN---------6.71
OXID--------N/A
NITR--------N/A

Analysis done by Oil Analyzers

 

[Blue99]

This is a bit of a puzzle!

The 195 ppm of sodium suggests it is a Mobil Clean formulation, possibly the commercial bulk oil product, but the non-API levels of zinc & phos don't fit the Clean formulation template.

And the viscosity of 12.86 plus magnesium of 69, all make this one hard to match up. TBN is still a very strong 6.7 after 4K miles.

But, nice report for this engine, I'd want to track this formulation down for future use!

 

[Al]

Probably Chevron 15w40..maybe Delo 400

 

[Pablo]

SM oil? Sodium Master?

Could be Mobil Clean with an add bomb.

 

[The Critic]

I'm putting my money on Exxon Superflo 10w-40 or Mobil Clean 5000 10w-40 SM.

The high 30wt viscosity tells me that its probably from a 10w-40 PCMO. The only ones that use a sodium sulphonate additive are Mobil Clean 5000, 7500, or Exxon Superflo, AFAIK.

A 6.7 TBN using the ASTM D-4739 method from Oil Analyzers is equivalent to a Blackstone Lab's 4.2 TBN, even though they both test using the same method. OAI's equipment is slightly off, I guess.

TBN of 4.2 isn't uncommon for an SM oil with 4300 miles on it if it was primarily driven on long trips, with little TBN depletion.

Mike

Mike

 

[Blue99]

Well, I'm starting to think the answer to the viscosity riddle is as Pablo implies, a car dealer applied dose of some crankcase additive with a VI improver.

Some kind of "motor honey" to make the engine quiet during a test ride.

This would also explain the elevated ZDDP levels.

Why run 15w40 or a 10W-40 in a Sentra?

 

[The Critic]

Blue99 could be right. It may indeed be Exxon Superflo or Mobil Clean 5000 5w or 10w-30, with some type of ZDP additive that also thickened the oil and provided somewhat of a TBN boost.

Mike

 

[Al]

I doubt you have a head gasket leak..but this engine is prone to leaking Head Gaskets.

 

[ToyotaNSaturn]

I agree with Pablo...it's been add bombed.