Starting my 80K miles tuneup/repair/refresh 05 SL600
1. There is a coolant leak somewhere on the passenger side, i suspect it's coming from the coolant line to the turbo, i don't see puddles on the floor but i see spattered dried coolant right above the turbo area, accompanied by coolant smell entering the cabin.
2. Car misfired a couple times a couple months ago, turned off the car and turned it back on made it go away. Hasn't misfired again in a 1000 miles now.
3. Lots of creaks and rattles when the body flexes, esp in the cold weather, i'm trying to track down and eliminate whatever i can.
4. UCA seems to be making squeaking noises while slowly going over bumps.
5. Water sloshing sound very audible in the front dash area while idling at start up, seems to go away when the car is warmed up.
6. When it's really cold out, under 20F, the radio doesn't work, all i get is loud static. Goes away when weather is warmer.
So the plan is to change all 24 spark plugs, while doing plugs i'll take a look at the turbo coolant seals and see if they're bad, flush the ABC system and replace filter with 3micron filter, inspect the intercooler circuit, might just replace the pump as well and try to find a way to bleed it. Inspect/replace UCA, drop the transmission pan and change filter, fluid, seals etc.
What else do you guys recommend for 80K miles? Just fix the things that need fixing, if it ain't broke leave it alone?


I'm looking to get some wheels like that
I'm pushing almost 160k and i daily drive mines so you got plenty of life in yours
things i need to look into
making a perfect intercooling system
some times when car off the front passenger side slumps down to car low Waring light, but the crazy thing about some times it happens in 15mins sometimes i can leave the car parked for a couple days and it maintain height ( so hopefull a full abc flush fixed that) sounds like a stuck valve
leaks a qt of oil after 1500-2k miles not really sure where (hoping its the pan gasket)
Ignition switch, dealer said i need to replace since key was replaced, my SRS light might be related not too sure but been on since my key was replaced
And just do maintenance where needed, im change my plugs next year since i did it last year (every 2 years)
And lots of mods (maybe 700hp and a blackseries kit)
As for your sloshing sound there's a heater core tsb. Not sure if it applies to your car or not.
When you replace your plugs be sure to have new silicone insulators on hand as well as the special grease/lube. I found Rock-Auto to have the best deal on the OE plugs btw. Valve cover gaskets might be good to do while you're in there too.
Good luck!


