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Thread: Castrol GTX high milage 15/40 ? worth a try ?

  1. #1
    Regular Member simac's Avatar
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    Default Castrol GTX high milage 15/40 ? worth a try ?

    My ickle 1.8 has been drinking oil since about 60k miles, now it's at 81k miles it has a mad thirst for oil. I do around 120miles a day for work and have to put in about 200ml every couple of days.

    It doesn't make any odd noises and i've not seen it smoke, i've been putting in 5w30 oil since Drinky did an oil change for me last year.

    Anyway, i've seen this GTX oil for engines over 75k miles. They reakon it helps to reduce consumption (i assume its thick lol) and contains conditioners to help lube seals and stuff in the engine.

    Thing is, it's 15-40 which isn't specified by VX for the car !

    http://www.castrol.com/castrol/produ...tentId=7027414

    Has anyone tried this stuff ?

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    Regular Member macdad's Avatar
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    Quote Originally Posted by simac View Post
    My ickle 1.8 has been drinking oil since about 60k miles, now it's at 81k miles it has a mad thirst for oil. I do around 120miles a day for work and have to put in about 200ml every couple of days.

    It doesn't make any odd noises and i've not seen it smoke, i've been putting in 5w30 oil since Drinky did an oil change for me last year.

    Anyway, i've seen this GTX oil for engines over 75k miles. They reakon it helps to reduce consumption (i assume its thick lol) and contains conditioners to help lube seals and stuff in the engine.

    Thing is, it's 15-40 which isn't specified by VX for the car !

    http://www.castrol.com/castrol/produ...tentId=7027414

    Has anyone tried this stuff ?
    No m8 i would'nt use it,there has to be a mechanical reason obviously why you are using so much oil,goes without saying that you've checked underneath for oil leaks,ie sump nut etc

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    Regular Member simac's Avatar
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    Yeah i've done the usual checks mate, have even watched the exhaust for smoke on a cold start to see if it's valve guides or something like that letting oil leak through. Can't see any leaks either !

    I think the 5w-30 is really thin oil and poss blowing past the piston rings, putting it down to wear and tear and can't afford a big engine job.

    I've just been looking at other ways to try and reduce the oil consumption.

    Cheers !

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    You'll probably notice a drop in fuel economy if you use thicker oil. You are checking oil level a few minutes after shutdown?

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    Regular Member simac's Avatar
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    Yeah Ste, tend to check it first thing in the morning or when it has been parked level for an hour or so. At the mo i'm doing between 500 to 700 miles a week, that's normally a litre of oil a week too !! it's nearly all mway mileage. If I cruise at 60/65 is uses a lot less but if I do a 100 mile trip at 70/80 it will use upto 300ml of oil LOL !!!

    It's getting to the point now that i'm just waiting for a big bang

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    Quote Originally Posted by simac View Post

    I think the 5w-30 is really thin oil and poss blowing past the piston rings, putting it down to wear and tear and can't afford a big engine job.



    Cheers !
    It's only thin when it's cold (hence the '5w'),which is a good thing in cold climates.When it gets hotter it flows like a 'straight 30' oil (hence the '30').

    The 15w-40 won't protect your engine quite so well when it's cold,but will be less likely to get past the bores when it's hot.So maybe you should use the 15w-40 (50?) in the summer and change to the 5w-30 for the winter.

    TBH,if you change the oil every year,the 15w-40 should be OK on its own.I use 10w-40 semi-synth in my V6 diesel no problem.

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    Try a 5W40 fully synthetic. Something like Fuchs XTR is a good one.

    Or just drop to 10W40 semi-synthetic. Most dealers seem to use that in servicing anyway...

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    The 15w-40 may be best because it stays thicker when it's cold.In this country we don't have extremes of temperature,and the use of '0w' and '5w' oil is only really necessary in extremely cold climates (less than -25 degrees c ! ).Vauxhall use the 5w-30 oil because it's a long life (more additives) economy (thinner) oil and helps the cars achieve a slightly better fuel consumption figure and it also extends the service interval.

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    Regular Member simac's Avatar
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    Thanks for the replies, i've got a few options there ! I might try the 10w-40 semi synth but it's an interesting idea to use the 15w-40 in the warmer weather.

    I've got about 1.5l left to top up with so will do an oil change when that's used up which wont take long at this rate lol !

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    There are also 20w-40,50 and 60s on the market too!

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