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Jamesx19
Monza


Joined: 10 Jul 2015
Posts: 195
Location: Brighton


PostPosted: Mon Sep 04, 2017 11:37 pm    Post subject: Reply with quote

Just an update:

Oil analysis by Millers showed a tiny amount of fuel. 0.2% dilution or about 18 ml! ie No issue and certainly does not account for the 200 - 300 ml increase I was experiencing.

(Interestingly, its enough to knock the oil grade from 50 weight down to 40 weight though! - Makes you appreciate that long periods with the car idling on a cold engine, or short runs will require more frequent oil changes, rather than high mileage long runs) Millers lab tech say that fuel evaporates off at a comparatively low temp. so a good hot run should get rid of a bit of this fuel contamination.

Also good news was there is very little wear contaminates present in the oil after 3,000 miles and engine is in good condition.

All back together now. One injector replaced as it was slightly down on others, otherwise no issue. Injector rails cleaned of rust and painted with POR15 to protect them, so that's one job that needed doing taken care of. - Cheers C11BRA

Oil level has dropped again!!! I think Skinny-monkey is right, and maybe simply a case of oil caught up, or not, depending on conditions.

(Also Ragpicker might be correct too!!)

Thanks again to Demort and others
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1998 C2 Manual
 
  
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skinny_monkey
Spa-Francorchamps


Joined: 16 Sep 2014
Posts: 317



PostPosted: Fri Sep 08, 2017 8:51 pm    Post subject: Reply with quote

The fuel dilution will be a small part of the drop in viscosity. It is more due to shearing of the viscosity index improvers
 
  
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