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can you mix oil brands? -when topping up?

sorry if this is a really stupid question, but my car will need topping up in a couple of weeks or so and i cant find selenia locally.

Can you mix brands, my car currently runs on selenia (need to call indy to check it is 10w40) but can i tip it up with castrol or some other product?

i was never bothered what i threw in my old car (g reg rover!) but sure you all understand how i want to look after this one!
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Re: can you mix oil brands? -when topping up?

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sorry if this is a really stupid question, but my car will need topping up in a couple of weeks or so and i cant find selenia locally.

Can you mix brands, my car currently runs on selenia (need to call indy to check it is 10w40) but can i tip it up with castrol or some other product?

i was never bothered what i threw in my old car (g reg rover!) but sure you all understand how i want to look after this one!
As long as you stay with the same composition ie Semi-synthetic and Grade (10w40) then you should OK I reckon
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Re: can you mix oil brands? -when topping up?

I agree, as long as the grade is the same you should be ok. It is not something I would make a habit of doing unless I had to though.
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Re: can you mix oil brands? -when topping up?

so its not the smartest idea but should be 'ok'?

might as well just ask my indy when i call to check what grade they put in.
thanks

Last edited by mo 156; 26-04-07 at 15:21.
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Re: can you mix oil brands? -when topping up?

If you fancy a drive out to Taplow near Maidenhead, SGT will have Selenia. Or you can buy it mail-order from Shop4Parts.
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Re: can you mix oil brands? -when topping up?

All present oils can be mixed; nothing harmful will happen (no sludge for example). You can even mix mineral or semi synthetic with synthetic (most of claimed full-synthetic oils have large mineral content as well).
The point is, that mixed oil , even the same grade and type may (but may not) loose balance of its additives and might not be up to the original spec. If your car is relatively close to oil change there is no problem, but I wouldn’t mix two oils if I expect to drive it for thousands of miles more. (Although the two might work perfectly together, but without laboratory test you can never know)

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Re: can you mix oil brands? -when topping up?

Does anyone rate Castrol GTX Magnatec by the way? I've seen lots of threads recommending oil but never that....
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Re: can you mix oil brands? -when topping up?

did a quick search before i asked and didnt spot a mention of magnatec here. maybe i didnt look properly
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Re: can you mix oil brands? -when topping up?

Either that or it's tat! Shame, my engine is full of the stuff...
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Re: can you mix oil brands? -when topping up?

Magnetec is Ok IMO but is very expensive for what is really a glorified mineral oil.
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Re: can you mix oil brands? -when topping up?

Yeah you'd be better off with Halfords own imo
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Re: can you mix oil brands? -when topping up?

Ah rats - I knew I shouldn't have asked....!
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Re: can you mix oil brands? -when topping up?

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Ah rats - I knew I shouldn't have asked....!


Castrol sell lots of low-ish grade oil based on their reputaion, ie GTX was the stuff to put in your Mk1 Escort but it doesn't really cut it these days imo.


Castrol R though, mmm the smell of that wafting across Oulton Park Hill Climb
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Re: can you mix oil brands? -when topping up?

Yeah, think I'm a bit behind the times, I've always had Castrol GTX but thankfully NEVER a Mk1 Escort.
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Re: can you mix oil brands? -when topping up?

I bought a Mk1 Escort for £30 as the donor car for my Dutton Kit Car. It was good fun for the couple of weeks before it got the chop

If you go as far back as the Cosworth DFV V8 Formula one engine they were run quite happily on 20w/50 standard oil such as you would chuck in your dailymobile. These days the main reason for thinner oils is to get the economy and emissions low and the better start up wear characteristics come along with it. I'd certainly keep the grade the same...and I personally think there is nothing wrong with Magnatec..which is simply a good quality semi-synthetic...like Selenia..which some people seem to give elixir like status to, for reasons which fail me. Who actually makes it is what I'd really like to know?

For top Q synthetics then Mobil 1 is good but pricey, and something like Redline if you really want to splash the cash. Some have reported increased oil consumption with the ultra thin full synthetics though..its just too slippery The main advantage of full synthetic is that it can last a lot longer before deteriorating as it has less impurities and much longer chain molecules..yet people who use it often still change it every 3,000 miles, particularly in the States. This seems to defeat the whole object of using it in the first place, and I'm deeply suspicious of the mental state of people who change oil that often.

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Re: can you mix oil brands? -when topping up?

as long as its the same grade oil its ok.Not best to mix old oil with new oil but if its just a bit then is ok
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Re: can you mix oil brands? -when topping up?

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Yeah you'd be better off with Halfords own imo
I've been using the Halfords own brand 10W40 semi synth in the green bottle for a few yrs and its fine and a good bit cheaper than Castrol Magnatec with the same spec
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Re: can you mix oil brands? -when topping up?

I asked my local mechanic this very question and he said yes you can. I think when i have my service soon they wont be using Selenia
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Re: can you mix oil brands? -when topping up?

All oils and grades mix without issue, another urban myth.

The only exception is castor based oils.

Cheers

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Re: can you mix oil brands? -when topping up?

dont people suffering from piles 'apply' castor oil?!
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