yes u can its still a 18 inch tyre it will be slightly narrower the correct size would be 235/55R18 but it would still fit.
I believe they would have been 215/70 R15.
Yes, you can . I have had those and 215/65 R 15 on my 97 Taurus wagon.
Yes, the only difference in these tires is the load rating and speed rating. The S is rated to 112 mph and the T is rated to 117 mph. The 108 is rated to carry 2.205 pounds and the 109 is rated to carry 2,271 pounds.
between 30 and 36 psi depending on the quality of the tyre. michelin 30 psi and up
yes
No, your speedometer will be off and power and fuel mileage will be adversely effected.
That depends on if the 15 inch rims will fit over the brake calipers.
Normally. yes.
Yes, you can
Yes, that is a pretty good substitute.
no there is too much height difference
Yes, if you mount as a pair. Both tires on axle must be the same
You can substitute these tries if need be. But if you do this your car will be off balance.
Yes, they can as long as both are the same on each axle.
Yes, that is reasonable as long as both sides match.
Standard 215-60-R15 tires can be replaced with 215-50-R17 tires by first installing new rims. The vehicle may need to be raised with a suspension lift kit to achieve sufficient clearance.