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Oil In Pot 3 And Loss Of Power

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Hi everybody

I gave my dad my 03 plate Avensis 1,8VVTI (he is retired). The car has always drank a lot of Oil, but then it started to lose power. My dad has a diagnostic tool and it stated that pot 3 was the problem, error code P030. Taking the plugs out the cylinder was coated in black Oil. He changed the Ignition coils over but the problem still states that Pot 3 is the issue. Another thing he did, was to use some much thicker Oil than recommended by toyota as he is going through 2l per 1000miles. Yet the car still passed its MOT recently!!!!!

Is the engine knackered, or is there a possible (reasonably priced) fix?

Thanks to one and all if you can help him. He lives in the sticks and is now housebound.


p.s. the car still runs smoothly with no knocks or bangs and it has done 80,000 miles

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