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To flush or not to flush

xjr41
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To flush or not to flush

Postby xjr41 » Fri Jul 12, 2019 8:05 am

Hello all.
The engine on my xjr has barely been started in the last 7 years and with the high oil pressure problem I have I think a decent oil change is needed.

So my plan is to drop the current oil and filter cold. Get that lot out and then new oil and filter and run up to temp.
Then drop this lot when hot and change filter and oil again for new.

Hopefully this will drag out most of not all of the old poisonous stuff.

My question is should I put an oil flush product through as well?
Or would that create me possibly more issues further down the road with old seals, gaskets, etc?

And if I do a flush, which product is recommended??

Thanks.
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pimgmx
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Re: To flush or not to flush

Postby pimgmx » Fri Jul 12, 2019 9:28 am

An old trick in the trade is to add diesel to the oil, let the engine idle for a while and then drain the sump; I don't know whether I'd want to do that with an R engine, though. ;)

I flushed the M52 engine (notorious for sludge) of my wife's BMW myself years ago, and we've done 50,000 miles without issues ever since.

A reputed Jag specialist used this to flush my 3.2 engine at ~150K miles: http://www.forte-benelux.com/EN/Forte-P ... Flush.html
Unfortunately, Forté is a local manufacturer, don't know whether their stuff is even remotely available your side of the Channel...

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stevemc
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Re: To flush or not to flush

Postby stevemc » Fri Jul 12, 2019 9:55 am

Jaguar xj40 1986 build D513 NBU vin number ends 504501
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donkeyotty
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Re: To flush or not to flush

Postby donkeyotty » Fri Jul 12, 2019 10:28 am

I used Forte recently in the Volvo petrol tank and it made no difference to my emissions reading, might be great on another car though. ;)

Engine flush, that is another matter entirely, lots of reading on tinternet about it, some good some bad, Could dislodge sludge to the detriment of the oilways and ultimately the pump ? I have also read that super duper mineral oils can find any weak gaskets or seals and then leak profusely from them ?
I think simple is best with a Jag engine, regular oil and filter changes and drain the oil when it is stinking hot is my favoured approach, good quality 10/40 semi synthetic being my tool of choice.
One thing I would never ever do is put diesel in my engine though, I would hate to think of the damage it would do. I hate diesels with a vengeance so no DERV is getting within 50 yards of 117 :lol:
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xjr41
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Re: To flush or not to flush

Postby xjr41 » Fri Jul 12, 2019 12:42 pm

Regular oil and filter changes are my preferred weapon as well but the lack of maintenance to this one over such a long period of time makes me uncertain about firing up this oil reaches a decent temperature. I've read so much on the internet like you say regarding engine flushes being good and bad that my head is in a spin. I think I might go with my original plan and flush the engine with a clean filter and engine oil.
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naki_k
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Re: To flush or not to flush

Postby naki_k » Fri Jul 12, 2019 4:10 pm

There’s also something called “Flushing Oil”. I have never tried it myself. Seen it on the shelf.
I have tried STP oil flush. A couple of engines, with no ill results, but I would stop short of “recommending it” since all engines are different in how something might effect them.
So on balance, maybe 2 consecutive oil changes should do the same job/ a safer bet.
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xjr41
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Re: To flush or not to flush

Postby xjr41 » Fri Jul 12, 2019 6:47 pm

So... Next question is the one that creates mass opinion.

Which oil?

I've always used Castrol Magnatec 10w40 in previous years, is it still the oil of choice?
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donkeyotty
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Re: To flush or not to flush

Postby donkeyotty » Fri Jul 12, 2019 7:47 pm

xjr41 wrote:So... Next question is the one that creates mass opinion.

Which oil?

I've always used Castrol Magnatec 10w40 in previous years, is it still the oil of choice?


Again tons on the tinternet about oil choice, read a recent post on a forum saying that Gulf oil was recommended, ECP branded Triple QX is not, apparently it is mixed with recycled oil :? One guy said he wouldn’t even have it in his mower. :lol:

I am not an oil snob, if I can get it for £10 for 5 litres I will, and have done, I figure a regular change with new oil is better than no oil change, and with 140k already on the clock, 217k on the Volvo, any damage in the engine was probably done years ago and a posh oil will not now make any difference.
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abercanadian
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Re: To flush or not to flush

Postby abercanadian » Thu Jul 18, 2019 4:45 pm

I use, and have ALWAYS used, in all my vehicles for the last 50 odd years, Castrol GTX 20-50 without any issues.

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xjr41
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Re: To flush or not to flush

Postby xjr41 » Thu Jul 18, 2019 5:57 pm

donkeyotty wrote:
xjr41 wrote:So... Next question is the one that creates mass opinion.

Which oil?

I've always used Castrol Magnatec 10w40 in previous years, is it still the oil of choice?


Again tons on the tinternet about oil choice, read a recent post on a forum saying that Gulf oil was recommended, ECP branded Triple QX is not, apparently it is mixed with recycled oil :? One guy said he wouldn’t even have it in his mower. :lol:

I am not an oil snob, if I can get it for £10 for 5 litres I will, and have done, I figure a regular change with new oil is better than no oil change, and with 140k already on the clock, 217k on the Volvo, any damage in the engine was probably done years ago and a posh oil will not now make any difference.


I'm goingto use triple QX as the flashing oil because it's cheap and EuroCarParts have got a sale on!
I will be using Castrol as the lifeblood but I'm still debating whether magnatec or GTX ultra clean is the way to go in a 10w 40 oil or whether I should go a little bit thicker because of the age and mileage of the car.
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