Question about 1998 Jaguar XK8

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A mechanic put regular 30w oil when he changed the oil..said oil is oil - I told him it requires synthetic 5w 30 - will this effect the car? Getting restricted performance intermittently.

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Hi, no it wont make any difference the 5 relates to it working in cold weather but unless you have got freezing temperatures or below freezing then you will be just fine, remember not to mix oils so if it needs topping up you need to top it up with the same oil as mixing can cause it to gel up a bit and can cause problems.

having this oil in your car wont cause any harm at all and you will be just fine.

let me know if you need further assistance ok
plz rate this solution as i have a whole page of unrated posts, thanks

Posted on Aug 27, 2010

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It can cause damage and a loss of performance due to the increase in friction to turn the rotating parts. The 30w oil has a much thicker viscosity at your engines normal operating temperature then does the required 5w30. Think of it as a a water gun filled with water everyone is having fun, fill it with pancake syrup and not so much fun. The 30 weight never thins out as much it remains pancake syrup. The required 5w30 starts out a thinner liquid so it can supply the needed lubricant to the valve train and bearings faster and reduces the friction between these parts. Good luck suggest you look for a more knowable tech.

Posted on Aug 28, 2010

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