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    Can quality of fresh motor oil be judged by smell?

    Apologies if this is a stupid question. Someone told me this years ago but I never gave it much thought at the time. I compared two brands of oil. One brand has little to no odour while the other has a strong petroleum type smell. They are both semi-synthetic oils priced at the lower end of the...
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    Volvo B230 knocking after oil change

    Hi All Just done an oil change and now have quite a pronounced knock under load. For example moving off from standstill at low revs. I can also make it do this by blipping the throttle once and then again just before the engine returns to idle speed. I seem to remember it making this noise...
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    Cleaning ability of Shell Helix HX7 10w40

    Hi All I have been running this in my Volvo B230 redblock for about 2.5k miles. Prior to changing the oil I noticed a light varnish visible through the filler cap on the bearing caps etc. This varnish is still present though the oil still looks very clean on the dipstick. I would have expected...
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    Shell Helix HX7 10w40 API SN ZDDP content

    Hi All I'm currently running this oil without issues but am due a change soon. I've read elsewhere on the site that this oil has 1200-1300 PPM of ZDDP. Can that really be the case when it carries the API SN rating? I thought it had to be 800 PPM or less to comply with that standard. Like I...
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    Oil recommendation for Volvo B230E engine

    Hi All First post here looking for some help choosing correct oil for my car. It's a 1989 Volvo 745 with the B230E engine. The car has just over 100k miles on it and runs very sweet with none of the noises these engines sometimes have. The PO who is a Volvo guy has been using 15w40 mineral with...
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