Vq25Det Oil Thread - So The Major Repairs Thread Isnt Derailed

[scotty nm35]

Nice, I have mine somewhere, similarly high silicone content which didn't stress me much. I wonder if it could be from the silicone based sealant used in assembly?

I definitely prefer 4000-5000k oil changes, but I always drop it right after trackdays and heavy dyno sessions when I know it's been given a hard time. Skipping service intervals with modern engines will definitely end in tears, I have seen it many times.

[MrStabby]

UOA number 2. 6000kms on Mobil 1 0W-40 (not Delvac 1 as stated in the report). Viscosity within spec this time. I believe this Mobil uses a grp IV basestock, and the SynPower uses grp III. Silicon ok this time.

Picture embedding is hanging my browser, so;

http://cdn.skylinesaustralia.com/forums/uploads/gallery/album_5500/gallery_15274_5500_65779.png

[Duncan]

hmm you must have been in the same queue as my check, took bloody ages to come back.

And I'm not really happy, the old place got taken over and the new reports no longer provide reference / benchmark data. I did call up and ask and they confirmed they would not do it anymore, just an overall OK or not.....they expect us to send multiple samples to show a trend over time

[MrStabby]

Yeah mine took ages too. They've definitely gone downhill a bit.

[MrStabby]

Oil sample #3 looking good at 7500kms. Oil is Mobil 1 0W-40. Viscosity is good, TBN is good, just some oxidation. I have noticed the temp gauge which is usually steadfast at about 2/5s has taken a few trips up to 3/5s for no apparent reason recently, and its been very cold in Sydney. Ill take a look at the cooling system and probably run the next to 7500.

[wht510]

How much are you paying for an analysis?

[MrStabby]

8200kms and looking good. As usual the oil is Mobil 1 0W-40. Since TBN (indicator of additive level) is still very high, and viscosity is good, ill run the next change out to 10k. Oxidation number is high, but AFAICT its not relied on much as the test can falsely read high. Since everything else looks good, especially TBN (which at 2 is still considered ok) it makes sense to extend the OCI.

@wht510 IIRC its about $40 each for the ones i got (there are options, and the website is shitty

http://www.alsglobal.com/en/Our-Services/Industrial/Tribology/Capabilities/Oil-Analysis.aspx

EDIT: Overheating mentioned in June 15 post was due to a badly clogged up radiator.