2001 Gs 430 Head Gasket?

[Ghosty]

first off going to family friends garage in few days just to double check. I have a 2001 gs430 just about 49k on clock, right so the story had water running noise behind dash had it since had the car(5 months). Yesterday went to check coolant saw was low in expansion at same time took oil cap off and found i had milky top. Thing is i changed the oil about a week ago and all looked ok on oil i just cant remember if i looked at the cap and if it was milky. so i cleaned the cap put some more distilled water in tank and ordered some toyota coolant off eBay at same time. I went for a good drive to warm the car up water behind dash stopped and drove good. When I checked today coolant has gone down in cap and small about of milky oil on oil cap.

Right car starts first time and idles good

most my driving is short distance so most big engine cars especially my jags have milky caps due to not warming up.

Temp always reads bang smack in middle no matter how long she is driven

Cant seem to see any oil floating in coolant tank but coolant is no longer red overdue to be changed.

No loss of power although had to tell from that 4.3 as powerful no matter that

so was thinking if anyone had any other ideas i mean i did put say 200ml more water in coolant and now its gone but the whole system has about 10 gallons. So would like to think all the miles i have done the expansion take was just thirsty. I mean no temp gauge moving for all the months i have driven. Am i just panicking over nothing and should refill water coolant again or plan for the worse. Just seems all the money i have spent in last few months sorting different things out and now i am faced with a very expensive repair. But also i would have thought it would be rare for a engine my milage made by Lexus would go wrong. I had a Jaguar that had 150k miles on her she blew a coolant hose twice loosing everything ran on low oil do to burn half it off and still no problems. So my luck of having a car that is in tip top condition go is annoying Having compression test done thursday as before thanks for any replies club has been such help since switching from jaguar to lexus

[ColinBarber]

if you have water noises behind the dash then there is a bit of an airlock in the cooling system. Happened to me a couple of times when I had my GS430 and that was with a Lexus dealer changing the coolant who should know how to fill it correctly!

It may be that some of the trapped air worked its way out which accounts for the drop in coolant.

When you come to change the coolant I would advise using the premixed Toyota coolant, I guess it should be the Red coolant with that age of vehicle.

[Ghosty]

Yeh guess right about air lock just this car is so perfect right now I panic with all signs . Well I say signs it's only few small things and as car running perfect. have coolant on the way toyota red concentrate as it was cheaper to buy 5L for £24 and buy 5l distillers water £3.99 Halfords.

Sure all is well just treating her like new born thought taking heads off that V8 dOesnt sound fun. Give me 4 clyinder and will take it to peices rebuild without any thought but get nervous with fine balance of V8 my XJ8 was same so sensitive to things