Will regularly have to park our 2014 XJL for 6 months each year. Any recommendations for things other than oil chnage, gas stabilizer and battery? On prior Saab used to put it on jack stands to prevent tire flat spotting; have stands and a floor jack. Is flat spotting an issue on the x351 for a 6 month storage. What's the proccess to use jack stands? Using standard lift points with floor jack doesn't seem to leave room to get a jack stand at the lift point.

 

If I was not using a car for anything over 2 months then I would be putting the tyres up to near 50 lb pressure to minimise flat spots. I always use a ctek battery conditioner when ever the car is not used for more than a couple of weeks as well.

 

You don't want to leave the car in the air with the suspension hanging at full extension. Remember that just like the tires, the suspension bushings are made of similar rubber compounds. Those bushings are installed such that they are neutral at normal ride height. If contorted for an extended length of time, they will take a set just like the tires would. Only tires will heat up and usually round back out and if they don't, are lot cheaper to replace.

Here in Texas, we don't worry about winter storage, but I have some classic cars that sit for a month to six weeks at a time and I just overinflate a little bit. I might get a little bit of shudder if I take one out of storage and immediately onto the highway, but they always smooth out in a few miles. If I were going to have to store a car for like a year or more, I'd probably look into buying tire cradles or flatstoppers (you can search google). But for six months, I think you're OK to do what Roviw suggested.

I discovered that trick back when I was learning to autocross and an instructor told me to inflate my tires from 34 up to 42-45psi so they wouldn't deflect so much in the corners. I was worried too much pressure would pop a tire but it never did and I noticed a lot of the other competitors carried small compressors or portable air tanks and did the same thing. Later I just extended the same philosophy to car storage. Just remember to let some air out back to recommended settings before you take your car back out into normal service.

 

yes maybe you should lift it up to avoid damage to the air shock suspension. Best regards