Fully synthetic oil versus semi synthetic oil

[HxPaul]

I asked this question in another thread.
Is there any advantage to using fully synthetic oil,as opposed to semi synthetic oil ? I genuinely dont have a clue what the advantages are and would be grateful if someone could enlighten me.

[coaster]

You will get a LOT of apposing opinion on this but my view is that fully synth is only really justified in highly tuned and or loaded engines. For engines with road type tunes then a semi synth is more than good enough. Eden on here has clocked up thousands of rally miles on high power engines using Rockoil Groundsman semi synth (sold for strimmers and chainsaws) with no lubrication issues whatsoever. I am also using this at the moment and can fault it, bought mail order in 5 litre cans it works out at about £2.50 a litre

For town or local riding, any mineral oil will serve but look for low smoke or low ash on the bottle as some can be a bit smokey.

[IaninDorset]

It is a bone of contention and many schools of thought and opinion on this issue, I did remember seeing a quite good article pointing out that a standard Lambretta or Vespa engine really wasn't designed to take synthetics as the oils are thinner and don't stick to the liners and bearings well enough on a standard engine as well enough as a good mineral oil would.

I use Rock City in my T5 and it does the job a treat, I used to use semi synth in my old Bajaj and it felt lumpy so chucked some Asda's finest in there and it ran like a dream

[mark1]

I've just started using groundsman as well, 200 miles done and no concerns...........yet lol

[IaninDorset]

Theres some nasty junctions on the M3, I nearly got wiped out by Chris Evans who swooped across the chevrons and three lanes in a merc, caught up with him at Fleet where I was going to rip his ginger head off his shoulders Grrr Bloke wasn't even sorry he nearly wiped out a rider

Think you gave the twistygo a bit of a worry, all that power and theres your ol' lammy just eating the speedo ^^

[jonoy]

what colour is rock oil groundsman

[sunrisemac]

Watching your video, I'm sold on the idea of Groundsman

[jonoy]

red

thanks

[jonoy]

where do you order your groundsman from ?

[jonoy]

thanks

looks like 2 is it the semi synthetic

[coaster]

Yes, semi synth

[jonoy]

thanks

[collector1967]

My god just seen 5lts for £12.21 + vat, i paid £13.75 for 1 ltr of Castrol power 1, i will be changing to groundsman.

Cheers Ian

[collector1967]

Just ordered 5 ltrs ,£24.00 all in, well pleased

[Rich Oswald]

Just ordered 5 ltrs ,£24.00 all in, well pleased

That's gone up a bit from £12 + vat?

[collector1967]

Bloody postage £8.00, still a good price i think

[robd]

Go to your local garden machinery shop rather than getting is posted. Think it was £48 for 4 x 5 litres when I bought some from my local place last year.

[MickYork]

Regarding the original post....what is the difference between mineral, semi and fully ? Oil's oil so how does "synthetic" fit in ?
Exol fully synthetic for me BTW pretty cheap and now in 20L containers.

[Rich Oswald]

I have just ordered 20L of the Exol Lubetech Fully Synth for £76 using the discount code se001. Works out at £3.80 per litre with free postage. I think anyone will find that hard to beat for a top spec' fully synth racing oil.

Rich'

[collector1967]

That sounds like a good deal with the free post.