one year plus old AMS oil

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Hi I have been using AMS oil 20W50 in my semi race VW jetta. I changed my oil about 14 months ago but the car was stored during winter. In total I have put on about 6000 KM normal usage and about 10 solo events. I am still driving on the same oil. The oil looks very dark almost black. Is this normal? I know AMS clamis that I can use the oil for one year but each car is different. My car does not burn oil and has a very healthy 11:1 CR motor. the problem is that oil gets dark and black after 2000 km. I want to send my oil for an analysis but I dont know where to send it and how much it would cost! Are there any oil analysis labs in Toronto Canada? Thanks in advance.
 

Patman

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Yes, there is an oil analysis lab here in the Toronto area. It's in Mississauga and it's called Wearcheck. Their site is wearcheck.ca
 
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Any oil will darken if it's cleaning other oil deposits or if the car is having some blow-by or other combustion related issue. Amsoil or any other synthetic/dino oil is not magically immune to this. Since you say your engine is "healthy" then I lean towards the clean up. What type of oil did you use before? How many miles total? Which 20W-50? Series 2000? About 4000 miles with some racing and 14 months are beyond Amsoil's recommendation as you state. Please send a sample to Wearcheck.
 

kickster

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the engine was rebuilt 2 years ago. It has less than 20,000K on it. I only used AMSOIL since day one. Oil stay clean for firs month or so and then it gets very dark. I have no blowby and after 14 months it has used less than 400ML of oil. My car runs a bit rich due modifications.
 
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