After doing all the regular stuff and issues with with w210, problem started with this knock I couldnt chase down after 250000 km only at idle ran great other wise , thought nozzles nope, almost gave up on it , my buddy recommended this stuff( Wynn's tune up in can) drive it for week or two before oil change, hell I dont know why but more Knowlegable people could chime in to the why part ! but she purrs like a kitten now I would like to share this with you! coming from a guy who spent akmost spending $2000 on a problem a $5 dollar can rectified

May have helped cleaned some oil passages and increased circulation possibly?

The change didnt coincide with the change from D1 to D2 did it.

What oil do you use normally?

What is your driving style. Short 1 mile trips or on the freeway for hours at a time?

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

If it is something that you put into your Engine Oil and you have Hydraulic Lifters it could have unstuck them or is keeping the pumped up at idle.

As an example in the past before multi-viscosity Oils were used and there was that ticking Hydraulic Lifter noise owners would add something like STP. One of the things STP did was to make the oil thicker which helped keep the oil pressure inside of the Lifters themselves as well as the thicker Oil helped take up some of the clearance in the bores on the Engine which the Lifters were riding in.

I do not know what type of cleaning effect STP has. But, the other type of addative was mostly a solovent designed to remove deposits inside of the Lifters and of course other Engine parts in hopes of freeing them up.

I have always wondered if putting addatives in Multi-viscosity Oil interfers with how it functions so I have never put addatives in it.

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84 300D, 82 Volvo 244Gl Diesel

LUBRO LIQUI MOLY SYNTHETIC SYNTHOIL MOTOR OIL 5W-40 , I drive mine like i stole it mixed hwy and city through out the day ,Im in sales so Im all over the place, no it wasnt the change in diesel fuel it was this oil additive noticed right away off and on for the knock then gradually went away fully ,something got cleaned,vavle lifter?

Using the correct oil can have many benefits - - some recognized, others not.

LM makes a fine product, just ensure you've got the one that meets the requirement of your car (229.xx).

Just to let you know, large bold font translates to yelling on the interwebs.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

Sorry, dont wanna yell lol , didnt notice bold writing must of hit button on font?