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Re: Oil & Timing Chains [Re: ZeeOSix] #5126149 06/05/19 02:55 PM
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dave1251 Offline
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Originally Posted by ZeeOSix
J300 shows the bottom end of 20 weight range as 6.9 cSt ... so at 7 cSt it was ready to fall into the 16 weight range.

The exact CST was 7.26 even at 7.0 it is not a 20 grade.


make the inside of your engine oil cap white.
don't use.
Re: Oil & Timing Chains [Re: dave1251] #5126152 06/05/19 02:57 PM
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ZeeOSix Offline
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Originally Posted by dave1251
Originally Posted by ZeeOSix
J300 shows the bottom end of 20 weight range as 6.9 cSt ... so at 7 cSt it was ready to fall into the 16 weight range.

The exact CST was 7.26 even at 7.0 it is not a 20 grade.


If he ran it much longer like some suggested, it would most likely have sheared into the 16 weight range.

Re: Oil & Timing Chains [Re: GaryPoe] #5126163 06/05/19 03:05 PM
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I maintain two cars that produce a carbon/soot like substance in the oil filter. Both receive cheap store brand oil, usually synthetic, 8,000 mile OCIs, mixed driving in Toronto's climate and both engines are known for timing chain problems. Currently over 200,000 miles on each vehicle. I think this soot and timing chain wear concern is over stated. If the chain, sprockets and guides are well made they seem to last the life of the car.

No doubt after I post this, my engine will skip time and bend all the valves.

Re: Oil & Timing Chains [Re: ZeeOSix] #5126167 06/05/19 03:07 PM
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dave1251 Offline
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Originally Posted by ZeeOSix
Originally Posted by dave1251
Originally Posted by ZeeOSix
J300 shows the bottom end of 20 weight range as 6.9 cSt ... so at 7 cSt it was ready to fall into the 16 weight range.

The exact CST was 7.26 even at 7.0 it is not a 20 grade.


If he ran it much longer like some suggested, it would most likely have sheared into the 16 weight range. From lots of UOA data summarized on the Mustang boards, it shows that Motorcraft shears quite a bit, more than most oils.



At this point it starts to oxidize and thicken. Do we really want to start mental gymnastics on what may have happened? Because the point was false hyperbole was presented as fact and you are doing a commendable job of attempting to distract from the facts of the post which was the lube was serviceable at the time of the change and within grade. Contradicting the poster.


make the inside of your engine oil cap white.
don't use.
Re: Oil & Timing Chains [Re: WobblyElvis] #5126183 06/05/19 03:20 PM
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ofelas Offline
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An oil/filter change BEFORE shearing out of grade is a timing chain’s friend thumbsup

Originally Posted by WobblyElvis
I maintain two cars that produce a carbon/soot like substance in the oil filter. Both receive cheap store brand oil, usually synthetic, 8,000 mile OCIs, mixed driving in Toronto's climate and both engines are known for timing chain problems. Currently over 200,000 miles on each vehicle. I think this soot and timing chain wear concern is over stated. If the chain, sprockets and guides are well made they seem to last the life of the car.

No doubt after I post this, my engine will skip time and bend all the valves.


R12 in the summer, Webasto in the winter, and cassette tapes all year.
Re: Oil & Timing Chains [Re: dave1251] #5126184 06/05/19 03:22 PM
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ZeeOSix Offline
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Originally Posted by dave1251
Originally Posted by ZeeOSix
Originally Posted by dave1251
[quote=ZeeOSix]J300 shows the bottom end of 20 weight range as 6.9 cSt ... so at 7 cSt it was ready to fall into the 16 weight range.

The exact CST was 7.26 even at 7.0 it is not a 20 grade.

At this point it starts to oxidize and thicken. Do we really want to start mental gymnastics on what may have happened?


You mean like the "mental gymnastics" of claiming it starts to oxidize and thicken at this exact point. Fact is it sheared down to nearly a 16 weight (starts at 6.9 cSt) at way less mileage then some recommend using it to. If the OP wants to change it early because of that, then who's to say he should run it longer ... especially since they don't own the vehicle or pay for his oil changes.

Re: Oil & Timing Chains [Re: ZeeOSix] #5126445 06/05/19 07:32 PM
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dave1251 Offline
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It did not shear and we don't know if it would shear beyond 7.26 or thicken. You are good at throwing hypotheticals to support the outcome you desire but not accepting the fact of what actually happened.


make the inside of your engine oil cap white.
don't use.
Re: Oil & Timing Chains [Re: dave1251] #5126450 06/05/19 07:34 PM
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ZeeOSix Offline
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Originally Posted by dave1251
It did not shear and we don't know if it would shear beyond 7.26 or thicken. You are good at throwing hypotheticals to support the outcome you desire but not accepting the fact of what actually happened.


What do you mean it didn't shear. What was the KV100 on his new oil (show the source) since you seem to know it all. I know Motorcraft 5W-20 is 8.5 cSt, which if his started there it sheared down15% in 5K miles.

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